BSVUSDT
Bitcoin SV / Tether USD
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BSV is Bitcoin

Kinda shocking people don’t know about Treechat. Then again I didn’t know about BSV a year agao…

You're confusing social phenomena with technical reality. Bitcoin miners make or break Bitcoin. If someone could bribe all of them with billions of dollars, they could render Bitcoin dead in several ways. Miners are part of a Nash Equilibrium so they don't do bad things like this. Also miners are a fairly large and diverse group all over the world with different and competing interests.

\> Can miners unilaterally change Bitcoin's rules for everyone already using Bitcoin?
Yes. And what "everyone" thinks Bitcoin is (or isn't) is not relevant. Bitcoin changes every time a new set of rules is rolled out. Just because you agree with all of the changes the miner have implemented doesn't mean you had a say in things.
Segwit changed the BTC consensus rules. The only way it was accomplished was by bullying and badgering miners, and making false promises of a 2x fork which never happened. UASF did nothing. Exchanges may have weighed in and encouraged miners to adopt Segwit, but this was just social pressure.
\> Craig's side had substantial hashpower and still ended up with a separate chain rather than control over BCH
Craig's overtly stated intent was to take over the BCH blockchain by having more mining hashpower. His dev team was not that smart so they got fooled by the BCH devs. The BCH devs hard forked right before BSV and added an opcode, which was included in the first post-BSV block. BSV tried to steamroll forward and it took them a full day to realize that the chains had split. BCH devs also added checkpoints to their node code which made it harder for BSV miners to do reorgs. But in theory Craig's plan could've worked.
BCH did not fail, as they never tried to change BTC ruleset. Their value proposition was that more scaleable BTC with lower fees and faster processing times would win out over BTC first mover inertia. Costwise BTC has gone parabolic while BCH has settled in at a normal price.
In the future there may well be contentious BTC hard forks. The most obvious fork would be a tail emission with supply inflation fork. Because miners won't mine BTC once the block rewards nears zero. Of course this will infuriate longterm hodlers but really it probably is the right decision to keep BTC alive over the longer horizon.
I'll grant you that human and social elements are not irrelevant for this discussion. Watching ETH roll back their chain was certainly interesting, and AAVE and other chains are doing similar things as we speak. But I can assure you that you have no say in what Bitcoin is or isn't by running a node.
The current blockchain fork of BTC that we call "Bitcoin" has the most cumulative proof of work. And thus it will remain. That's why BTC has so much value.

You're still conflating two separate questions:
1. Can miners create or sustain a chain with different rules?
2. Can miners unilaterally change Bitcoin's rules for everyone already using Bitcoin?
I agree with you on (1). I disagree on (2).
The fact that BCH, BSV, and other forks exist proves that miners can create alternative chains. It does not prove that miners can force existing users, exchanges, custodians, wallets, and businesses to follow those chains.
You keep returning to Satoshi's "longest chain" rule, but that's incomplete. Bitcoin nodes don't follow the chain with the most proof-of-work unconditionally. They follow the valid chain with the most proof-of-work. If I change my software to allow 100 BTC block rewards, I can mine the longest chain in the world; nodes enforcing the existing rules will still reject it as invalid.
That's why a 51% attack and a consensus-rule change are different things. A hashpower majority can dominate block production under the current rules. It cannot automatically redefine what counts as a valid block for people who continue running the old rules.
The BCH example actually demonstrates this. BCH didn't fail because it lacked the ability to exist. It failed to replace BTC because the economic ecosystem continued valuing BTC's rule set more highly. If hashpower alone determined Bitcoin, then whichever side had more miners at a given moment would simply become Bitcoin and the other side would disappear. That's not what happened.
Regarding SegWit, saying miners "changed the consensus rules" doesn't really support your broader claim. SegWit activated because enough participants across the ecosystem ultimately coordinated on it. If miners were the sole source of authority, there would have been no need for years of political conflict, signaling battles, exchange statements, user campaigns, node operators threatening UASF activation, and so on. The entire history of Bitcoin governance shows that consensus emerges from coordination among multiple groups, not from miners issuing commands.
The BSV/BCH split also illustrates the point. Craig's side had substantial hashpower and still ended up with a separate chain rather than control over BCH. That's exactly what I'd expect if hashpower is necessary but not sufficient. The result wasn't "the miners changed BCH's rules." The result was two incompatible networks and the market deciding how to value them.
As for BlackRock, I don't think their fork clause proves miners are sovereign any more than it proves BlackRock is sovereign. It actually highlights that Bitcoin's identity is socially and economically determined. BlackRock can call chain X "Bitcoin." Miners can call chain Y "Bitcoin." Exchanges can list chain Z as BTC. The question is which designation the broader ecosystem accepts. That's a coordination problem, not a pure hashpower problem.
So my position isn't that users magically overrule miners. It's that Bitcoin consensus is produced by interaction between miners, node operators, exchanges, custodians, developers, merchants, and holders. Miners are extremely important because they secure the chain. But the existence of every major fork in Bitcoin history is evidence that hashpower alone does not grant the ability to redefine Bitcoin for everyone else.

\> SegWit activation demonstrated that miners are not the sole decision-makers
Nope. It's you who is arguing against yourself. Miners make the blockchain according to a set of rules that they control. Luckily there are a lot of miners and they haven't formed a cartel. When miners try to form a cartel (this has happened), other miners get together and smaller miners switch pools etc. You're correct that more than 51% mining power would be needed to force new consensus rules, this is simply because of probability and miners outside the 51% getting blocks through occasionally. The only time a mining cartel \*was\* successful in changing consensus was the Segwit fork, which changed Bitcoin forever, and by the way, didn't alleviate the silly 6 transaction per second limit that BTC still suffers from. That's why Segwit took so long to roll out, it was a ton of work to bully and deceive miners into adopting the new ruleset.
You've hugely overestimated the power of "Bitcoin users". The BCH fork could've gone another way, and what you think is BTC could just be what is called BCH right now. It all depended on which fork the miners chose, and how much hashpower was directed at it. The ticker symbol and name mean effectively nothing, other than that a group of people chose one and others agreed to it. The "BTC" chain has actually forked like hundreds of times since it was launched. Blocks get orphaned all of the time. Sure, exchanges have the ability to say "Bitcoin is chain X" but Satoshi's whitepaper says Bitcoin is the chain with the longest proof of work.
BCH forked deliberately from BTC, and they implemented replay protection. If you don't know about the BSV fork, there you'll find an example of a contentious fork. Craig Wright and his buddies spent hundreds of millions to try to take over the BCH chain. They had a lot of mining power and BCH was in trouble. In the end, they got tricked because BCH also hard forked and added new opcodes, while BSV added opcodes that weren't valid on the new BCH chain, so the network split almost immediately. Even though Craig had tons of mining power, all of the blocks he was producing were incompatible with BCH blocks. So he couldn't build the BSV chain over the BCH chain. By the time the BSV team figured it out, the new BCH chain had way more proof of work, and BSV could never catch up. But if BSV had more mining power for a few months, they could've overwritten BCH consensus rules. They could also try it again starting from scratch.
Did you know that the Blackrock IBIT ETF contains a clause regarding forks to the BTC chain? [https://protos.com/if-bitcoin-forks-the-spot-etfs-could-choose-the-winner/](https://protos.com/if-bitcoin-forks-the-spot-etfs-could-choose-the-winner/)
In this case Blackrock would simply say "Fork XXX is Bitcoin, we're following a chain that has less proof of work and since we have more money than God, this fork is now Bitcoin". This is a good example of the sort of thing you believe happened during the BCH fork, and it's also a good example of why that doesn't work. Blackrock would be left behind, holding forked coins that would steadily lose value.

I think you're mixing up "what chain can exist" with "what Bitcoin users will recognize as Bitcoin."
Nobody disputes that miners can create a new chain with different rules. BCH, BSV, Bitcoin Gold, and countless other forks prove that. The question is whether miners can *change Bitcoin's rules for existing users without their consent*. That's a different claim.
A 51% attack does not give miners arbitrary power to rewrite consensus rules. It allows them to censor transactions, reorder transactions, perform double-spends against recent confirmations, and generally control block production. But if 100% of miners started producing blocks with 100 BTC subsidies tomorrow, nodes enforcing the existing rules would reject them. Hashpower does not magically make invalid blocks valid.
Your argument that miners could simply spin up thousands of AWS nodes misses the point. The number of nodes is irrelevant. What matters is which software exchanges, custodians, merchants, wallets, payment processors, and users choose to run. Consensus is ultimately a coordination problem. A million miner-controlled nodes running modified rules don't force anyone else to accept those rules.
BCH is actually evidence against your position, not for it. The BCH miners successfully created a new chain with different rules, but they did not force BTC users onto that chain. The BTC chain continued under its existing rules because the economic majority continued recognizing those rules. If hashpower alone determined consensus, BCH would have replaced BTC rather than becoming a separate asset.
Likewise, SegWit activation demonstrated that miners are not the sole decision-makers. Many miners initially opposed activation, yet ultimately signaled because they faced the prospect of a chain split where economically significant participants would reject non-SegWit blocks. You can argue about how effective BIP148 was in practice, but it's difficult to argue that miners simply imposed their preferred outcome on everyone else.
Satoshi's original design absolutely assumed that miners would validate blocks. But Bitcoin's security model has always included independent verification. The famous phrase is "don't trust, verify." If verification by non-miners were meaningless, there would be little reason for users, exchanges, or businesses to run validating nodes at all.
So yes, miners can create a new chain. No, a hashpower majority cannot unilaterally redefine Bitcoin for everyone else. If they could, every contentious fork would have ended with one side disappearing instead of multiple chains continuing to exist.