Red Matrix, a descendant of friendica, not to be confused with matrix, solves this with portable profiles. The account is tied to an instance, but your profile is liberated:
Checked out Red Matrix, and it instantly fulfills the worst tendency of alternative decentralized social networks. Centralized social media takes on the moderation in a way that typically leads to the banning of racist and toxic groups and those groups are often the first to set up shop in the censorship resistant alternstives. The very first landing page of Redmatrix takes you to the Aryan Nation Radio community and a bunch of antisemitic and racist content. This is a major turnoff to anyone pursuing alternatives and while I support free speech and think even the worst of humanity should have a home to be terrible with each other, figuring out how to keep this off the home page is probably a good idea to get these alternatives into the adoption phase.
https://redmatrix.info/help/accounts_profiles_channels_basic...