There is no singular definition of a community on nostr. I am proposing one of many alternatives. in this model noone can stop you from posting to a community. the community would exist as notes spread across different relays. there could be a canonical relay list associated with the community, but there could be forked or hidden parts of the community on unofficial relays. these are just different views of the community associated with the sha2 id of the community.

@jb55 Nackoo’s frame of reference is a admin/moderated telegram community with channels. Non-moderated generally means no admin. However, if you are running a relay on which the community operates there is an admin capability (i.e. can whitelist, blacklist etc). @jb55 does your spec envision a community that can be run solely on one relay, or multiple relays?