@atomicpoet one argument I read somewhere: With Mastodon, if the server you are on is completely down, you cannot move your data. With BlueSky that should be possible. And it was claimed that retrofitting such a feature to ActivityPub (not talking about Mastodon) was considered difficult. Sorry, I cannot remember the source, perhaps it was https://github.com/bluesky-social/atproto/issues/255#issuecomment-1287953987
@kontrafiktion It's hard to do with Mastodon, but it's easy to do with Zot -- which is what Hubzilla uses for nomadic identity.
Hubzilla also uses ActivityPub, by the way.