I really don't think you can blame Effective Alterism (EA) or these guy for FTX. FTX was a fraud and it occurred because Sam Bankman-Fried used customer money to prop up his failing investment company (Almeada Research). To be blunt he stole from his customers to try and prop up a failing business. He also lied, used customer money to fund a lavish lifestyle, used customer money to donate to political causes, etc.
Basically, I doubt Effective Altruism condoned stealing from people to prop up businesses, fund personal causes, and enrich oneself.
Actually the belief that you're good or "doing altruism" is exactly the kind of thing that would cause a person to do such evil things.
If we take bible metaphorically it's pretty smart because believing you are a inherently unworthy sinner will actually encourage you to do good things instead of the opposite which just causes people to do evil things and virtue signal.
Basically "But we're the good guys" <- that's how you know who is truly evil.
> it occurred because Sam Bankman-Fried used customer money to...
This is a weird use of "because". You're saying roughly, "the fraud occurred because <the mechanics of the fraud>". That stuff is not why it occurred, it's how.
People do things for reasons.
> fund a lavish lifestyle
More lavish than portrayed in his PR and parroted by EA leaders, but less lavish than a typical billionaire in his situation (to say nothing of a typical crypto billionaire!)
Spending some money on nice, convenient living for himself and his team is not inconsistent with longtermism. To use a CS term, it's analogous to the concept of amortization.
Basically, I doubt Effective Altruism condoned stealing from people to prop up businesses, fund personal causes, and enrich oneself.