Why on earth would you "expect them not to steal it in the same way you expect a bank not to steal your deposits" when a cryptocurrency exchange / hedge fund is not subject to even a fraction of the regulations banks are?

Especially when prior to FTX's collapse, numerous other crypto exchanges were turning out to be scams or going under, and even back then there was plenty of evidence that crypto was being used and manipulated by nation-states and criminal organizations? And it was practically a meme that crypto was full of shysters and scams?

Comparing putting your money into a too-good-to-be-true crypto hedge fund is nothing like "a bank manager stealing money to pay off his gambling debts." I won't name a culpability breakdown but there is no way you have 0% responsibility here.