Once you are signed up, it's tempting to use it. Then you realize it's a bad idea to use it, but it takes self-control.
Now, with the current leadership, who knows if they will purge inactive accounts and/or reissue IDs.
I don't know if this scenario accounts for much of the antagonism, but it is one possibility. It is possible that some people don't like it, but can't let go of it completely, and the new management creates uncertainty and doubt that never ends.
If you work for a large US tech company, you are replacable automata. How do people not know this? Am I the crazy one here?
It was easier to ignore this when they had a more benevolent dictator.
Musk gets away with it because he's the owner but most social media and tech companies aren't led by this awful people.