Tonight I came across that kind of "coincidental transfer": A just received money, and two minutes later, the same amount is sent to B, with a bunch of conspiracy theories in the comment section... Basically, most of the time it's just that the path hasn't been broken down and looked at.

First, treat the blockchain as logistics: where does this money come from (exchange hot wallet / cross-chain bridge / contract redemption), is there a detour in the middle (aggregator routing, currency exchange, splitting orders), and who is the final recipient (new wallet or old address, is there batch collection).
Many "coincidences" are actually the same person / the same script moving assets, or the pool's slippage is so bad that they are forced to change routes, filling orders like patching a system.
Recently, modularization and the DAO layer have been hot topics again, developers are excited as if they've discovered a new continent, while users only see on-chain as "why is there another layer";
I only care whether an extra layer means one more strange match or worse execution...
That's all for now, I'll complain again tomorrow.