I would like to draw your attention to an issue regarding the banning of users within a community. Currently, when a user is banned from a community, they are completely prohibited from posting. However, I believe that this is not an ideal solution as it can lead to fragmentation within the federated network. If different instances do not agree on the reason for the ban, it could cause each instance to create their own community, making the federation pointless. Each instance would have practically the same communities, and none of them would be federated with one another. Instead, I suggest that banned users should still be allowed to post, but their posts should be hidden in that instance. This would help to maintain the integrity of the federated network and ensure that all instances can share the same communities. Alternatively, you could consider merging communities across instances.
Communities are completely independent from one another, even if they happen to share the same name. So if you are banned from community A, you can still post in community B. Another matter are instance bans, if you are banned from an instance then none of your posts will be visible there, or in any of its communities.
Also its called football.