this post was submitted on 07 Jul 2023
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It would be convenient to have a Fediverse wide login, but it would carry too much baggage in terms of overhead and security. They'd have to carry the whole of the user database across all of the Fediverse, not really feasible. Then there's security concerns over sensitive data like email and passwords. So probably not something that could ever happen.
A sync feature between instances might be do-able. Could be handy. I have a couple instances where I'd like to sync community subscriptions.
There would not be a need to duplicate or sync all user databases across the fediverse to support SSO. In fact SSO already exists in other contexts and I haven't heard of any implementation that works that way. It's essentially accomplished by the authority and the service exchanging login tokens.