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\> 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.

. BSV will replace btc as digital currency. Think deep, reaserch. You will be astonished with facts and figures