I’m trying to work out why there are posts in here about users being banned from communities, when neither the user or the community are under their control. Is this being mirrored from somewhere, or is this something that’s limited to what people on their instance see?
They are also, apparently, banning users that have never been to their instance.
You can be known to the instance by interacting with communities they federate with, without ever interacting with a community on that instance, right? They’d just have to know your username to block you.