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.)