Delete the login and re enter it. That worked for me

Arguably if you are worried about remote admins, that’s not a problem-you just issue the creation of the Note without an owning user or pointing to a magical AnonymousCoward user and change the server code to allow that. Then when the note propagates across instances nothing links it to the original user. Of course the downside is the original user won’t get notified of replies to the post and such, but so much is the price of anonymity, I guess

But an evil instance admin would also be able to log the IP of the throwaway account too. So that’s not any better. The bigger issue is with the moderation side - how do admins deal with troll anonymous posters? Blocking an account is less useful when there’s no account. Arguably it could be a community-specific option to allow anonymous posting.