I believe you are describing federated networks such as mastodon [1] and matrix [2] Individual servers/clusters can be moderated by their operators. I've not

I believe you are describing federated networks such as mastodon [1] and matrix [2] Individual servers/clusters can be moderated by their operators. I've not run either of those, but I have run IRC servers that can work in a similar model. [1] - https://joinmastodon.org/ https://joinmastodon.org/ [2] - https://matrix.org/faq/ https://matrix.org/faq/