Edit:
I reached out to Lemmy World admins (!lwadmin) and they said:
If a user is banned on their home instance then it federates to others, if banned on instances other than their home, it doesn’t
If they’re banned from their own instance, that ban federates out and they’re completely banned off that account.
If some other instance bans them, that ban is instance specific and that person can still interact with communities and people from other instances, except the one that banned them.
It doesnt federate its just that he cant write anything on the home instance => so he cant post on non local instances he is locked out of his account
It could’ve changed since then but back when I ran my own single-user instance I had bans federating in from other instances listed in my admin panel.
Ok weird as it is useless tbh. As the user can only post FROM their account and because of that its impossible to login from non local instances.
It’s not useless, it’s so that the ban can be displayed on other instances. If it weren’t propagated, you couldn’t know if someone was banned without explicitly looking up their profile on their home instance.
As far as I understand;
A user is specific to one instance. In order to interact with the fediverse on that specific account, they need to log into that instance. If they’re banned from that instance, they cannot log in and interact with the rest of the fediverse.
There’s nothing stopping them from logging into an alt, whether on that same instance or on another instance.
I am not an expert, only a user, so take my remark with a grain of salt.
To my knowledge a banned account is only banned on the instance that bans the account. Federated instances would not automatically ban the account unless they have a bot or some similar function specifically for that.
Obviously, automatic federated banning would be a huge, massive problem for Lemmy. If a small, tiny instance decided to start banning accounts for whatever reason, the accounts being automatically banned on all federated instances would be a major design flaw since instances start off as automatically federated.
