Would you recommend your tool to use with a single instance for a local community that won't be interested in federating? I mean self hosting by one person, likely via docker, exposing to a few hundred people, not federating at all, all data should be kept within the community, not public.

If yes, do you think it's already mature enough to give it a spin?

> all data should be kept within the community, not public.

I would recommend it for everything you said except for this part. Everything posted is publicly visible by design. I'm afraid I have no intention of changing that. You're free to fork it if you want though.