Effective altruism weights large amount of utility that are distant from the user higher than non-utilitarian moralities such as familial obligations, purity, or fairness. From an EA perspective, SBF made a morally correct gamble since his intent was to donate all the winnings. The discounted utility of donating the potential winnings of shitcoins outweighed the utility of not doing so. Perhaps it would be wise to re…
EA perspective is not limited to one specific moral foundation (in this case act utilitarianism), it is a general idea that if you are going to be altruistic (for whatever reason), you should rationally focus on how to get best 'benefit to others' for your money. EA is not moral philosophy, it is altruistic strategy. For some, altruism is not even connected to morality.
So the gamble you describe is more argument against act utilitarianism than against EA.