Indeed Twitter has seen a resurgence among the (serious) AI crowd in particular. For example Bluesky (not to mention the fediverse) can get aggressively negative towards authors posting what seem to be pro-AI posts.
Ignoring the political issues, my problem with Twitter is more prosaic: the character limit is too short for basically anything of substance. I really don't like the thread style it effectively forces.
(Oh, and the new name is unbelievably stupid. I ain't never calling it that.)
That's pretty much my one gripe with the general culture of the Fediverse, a lot of people have made opposition to AI in general part of their identities and it can be a little tedious to have discussions at times because of it.