This link posted there seems concerning. Any individual instance can issue a federal ban? https://lemmy.pineapplemachine.com/post/5781
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I believe it's ban logs that are federated, not the bans themselves, but I don't have any proof. Could someone running a personal instance test this by banning a remote user and see if they can still interact with other remote instances?
Note that if a user is banned by their home instance, it's expected that they can't interact with any remote instance either, as all of their posts will pass through their home instance first.
If Beehaw bans from the site someone that is on a remote instance, that account can no longer interact with any Beehaw communities. If Beehaw bans from the community someone that is on a remote instance, that account can no longer interact in that community.
That makes sense, but I think what Smoke assumes from the federated mod logs is that if Beehaw bans me (a remote user) from beehaw.org and the ban message federates over to my home instance feddit.dk and lemmy.ml, I will be banned from feddit.dk and lemmy.ml as well. While it's unlikely that bans can federate between instances, I don't have any proof of this.