this post was submitted on 06 Feb 2024
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It's entirely technically possible. Apps already use third party identity providers all the time, you just need federated apps to support OAuth both for signing in on the client and as a backend identity provider, and standardize how federated apps return user info that would be common to any federated app (usernames, saved / liked posts, subscribed feeds, stuff common to the ActivityPub spec).
You could use the same credentials to open a new account on another instance, sure, I guess. You still have to create another user on the new platform with their own ActivityPub inbox and so on.
I guess to a non-technical user that might seem like the same thing, but then again so would your home instance allowing you to view other platforms. The second one would be way cleaner and easier on instance maintainers.