TCP
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Lol bought also a mausoleum sa kanila. Nung patapos na ako magbayad, kinompute ko yung nahulog ko na plus yung spot down ko tapos tinignan ko yung nakalagay sa TCP. Muntik pa ako maghulog ulit buti na lang nagcompute ako kasi sosobra na yung hinulog ko sa TCP na indicated. May two months pa ata akong remaining non pero di na sa akin pinabayaran kasi sinabi kong sobra na yung hinulog ko

OP said "smallest of time scales", NIC disqualifies from this.
\> then you are guaranteed (literally the same length of wire) to have the same latency as an incumbent
This is not true for all exchanges by any means. Some may not guarantee same length of wires (or only do so to a fuzzy tolerance), switches can change latency despite same length wires between them, and depending on the infrastructure at the other end there are various higher-layer (e.g TCP) tricks that have been written about.
Or you can have NASDAQ: [https://www.reddit.com/r/technology/comments/1jbczh8/nasdaq\_has\_begun\_discontinuing\_a\_highspeed/](https://www.reddit.com/r/technology/comments/1jbczh8/nasdaq_has_begun_discontinuing_a_highspeed/)

You got lucky. This isn't a profitable strategy as you've presented it because it's too slow. There's a range of factors required to have a profitable arb strategy like proximity to exchange, dedicated blockchain nodes, message sizing, order signing and then also techniques to beat the queue (think TCP pre loading strats etc) and a few more. Anyone using this needs to realise how far into the past you actually compared to execution time.