The idea would be the servers would have shared ban/block lists and similar rules so that they can share the load of having open sign ups.
Basically a coop of instances to improve on-boarding. If you join the coop then you get added to the pool of instances that get assigned normies at random.
If the authentication was federated it’d be ideal as well but I assume this would be outside the scope of AP and would cause issues if you tried to post from your mastodon.social account from mastodon.world’s server for instance.
bufalo1973@lemmy.ml 1 day ago
The authentication could be another service, split from Mastodon, Lemmy, Pixelfed, … that only gave that service. The instance asks the auth server about “user@instance: password” and the server just says “OK/fail”. That or sending the user to the auth server to get a session cookie.