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.