Effective Altruism is in fact a cult. They do weird sex stuff. They have a theory about how the world will end in their lifetimes. That doesn't make everything they say wrong, but when it comes to cults, what more could you want?
we've reached the phase where a bunch of people have learned about EA or rationalism for the first time, have decided it's insanely weird and cultish, and are now reverse-engineering reasons to hold this belief