[cortesoft]

Right, but my point is that this is a problem that the AT protocol is trying to solve. You pointing out that it is a problem elsewhere is exactly the point; why not try to solve it?

This is especially important for a federated system where individual servers may come and go, and you want to have the ability to move your account if the server goes down or starts doing something shady.

Part of the reason people choose a centralized social media service is because they know their account will last and they can build a reputation. Unless you can move your account and maintain your reputation, a federated system won't have that trait.