this post was submitted on 22 Sep 2023
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Feeds/timelines are first-class citizens in the AT protocol and are decoupled from account hosting.
On Mastodon, your timelines are computed by the same server that hosts your data. Consequently, signing up to a server to have an account on the fediverse is the same thing as joining a community. You follow the servers rules and share the same local timeline as everyone else on that server.
On Bluesky, feeds are arbitrary, fungible and provided by any server, and it can be computed/curated/moderated however they like. So communities are "built" around feeds rather than around account hosting providers.
The AT protocol also has "real" account portability (though I have not seen this demonstrated in practice https://atproto.com/guides/overview#account-portability). On Mastodon, account "portability" is a delicate dance that requires the cooperation of both the origin and destination server.
Mastodon has something that Bluesky currently doesn't: real federation. The Bluesky server that everyone signs up to doesn't federate with anyone else, since the whole protocol is still a work-in-progress.
My money's on BS never federating at all. Mastodon Instances are communities unto themselves. The way BS is set up means an "instance" is essentially just free additional hosting for BlueSky Inc. It's decentralized similarly to how crypto is decentralized. Of course, what else would one expect from Jack.
For real. It's not like Twitter was markedly different before Elon.
There's a sandbox with federation with third party clients already live. Every piece of the system can be federated or substituted.
If somebody wanted to fork out and federate in open now they could. They aren't doing so because it's still work in progress, especially moderation tooling and scaling needs improvements