The most recent and largest exodus was people protesting their apps going away. Imagine a person for whom site moderation leading to embracing Russophobic snuff films, excusing Nazi tattoos, genocide denial re: Palestine, and general censorship of the left were not reasons to leave but “my apps and app freedoms” moved them.

So yes these are people obstinately fighting over something they just made up but it sounds right to them and matches the vibes of their parasocial bubble. They might literally die if they spoke casually and acknowledged faults.