They're leaving Musk, but they're not leaving his financial backers, and they're entering into the same kind of "possibly sold to a fascist despot at a moment's notice" situation they just left.
It's short sighted, perfirmative, and doesn't actually make the Internet better at all. It just tells us that people prefer a closed Internet owned by billionaires.
To a platform that has been on the record about not kicking ouy Nazis, though.