I dont think you've taken into account what people in lemmy value the most.

Their principles. They mostly joined lemmy because one of their principle is against big corp controlling us for their own purpose.

That's why threads is being blocked preemptively. Because they are corpo. Now compare that to exploding heads instance. The slowness of blocking another instance because of hate speech and bigotry. It's because exploding heads issue does not or barely touched most lemmy peoples principle trigger. They allowed it to exist first for a long time before even considering of blocking it