Previously met a few people offline who manipulate small coins. They would pump like crazy on Exchange A's contracts and then dump on Exchange B. In the end, the associated accounts on Exchange A got liquidated and frozen for tens of millions. Not a word was said—they were clearly manipulating. Back in the day, the 50k guy went long on OKX and short on BTMX, another classic AB strategy, profiting from OKX's arbitrage users' liquidation losses.