I actually think the opposite: people commit huge frauds, stealing money that could have saved 100s or 1000s of lives, and then get suspended sentences.

Ironically for SBF, Effective Altruism itself equates such actions with murder (or at least manslaughter). And his actions were culpable too. This was not an accident or a misunderstanding or human error or bad luck. He stole (and squandered) billions.