You can have public access or high signal, but rarely both for very long. Groups have the same dynamic as relays. They don't need moderation, so long as they stay small.
Discussion
yep, that's what i mean... joining is just opening the client and adding the relay
moderation is minimally required for those edge cases of infiltration behaviour
allowing these groups to cross to multiple relays is important especially for the case of small, affinity groups, whose infrastructure may not be expensive and reliable, in fact, in our case, we may even be running fully customised things on it which adds to the risk of downtime, so building in the ability to add redundancy to it by multiple members of the community running relays and they may not necessarily participate even in the same channels on them overmuch but have other associations with each other that are of a lesser depth, but in this way they back each other up
That isn't really a community, tho. It's more an association or cluster.
Community is about being in communion.