Today I saw that kind of "coincidental transfer" on the chain again: A just moves, B follows immediately, and the group chat quickly starts conspiracy theories.

Now I force myself to analyze the path—first check if it's the same batch of consolidated addresses moving assets, then see if there's a routing/aggregation layer changing shells in one hop, and finally consider whether someone is watching your orders.
Honestly, many "coincidences" are just fees, risk control, and scripts running timers; it's not that mysterious.
By the way, recently there's been talk again about miners/validators eating too well and MEV ordering being unfair. I find it annoying too, but on the flip side: the more chaotic it is, the more we need to clarify on-chain behaviors. Otherwise, when emotions run high, people will leverage, and liquidation lines will come knocking… I’ve also slipped up before.
What I fear most isn't missing opportunities, but rather that I can understand what's happening but am too lazy to confirm that crucial step.