This is exactly why federation is better than centralization - no single point of failure. If Reddit decides to do something nefarious like cutting off your 3pa access or Facebook sells all your personal data, you have no recourse. But if you disagree with some admin actions on lemmy, you can go to another instance. Yeah you lose your karma, but there is no shortage of usernames. I guess the only single point of failure is the developer of the lemmy software itself. From that perspective, also joining the one lemmy instance run by the lemmy developer doesn't help things xD