

I think this is yet-another reason to have a separation between users and communities at the instance/domain level.
Setting up a server should require one top-level domain and two subdomains:
https://myserver.com/would be for webfinger and the actual backend.https://groups.myserver.com/would be the subdomain for the AS2.Group actorshttps://people.myserver.com/would be the subdomain for the AS2.Person actor






But we are not going to get “niche” users if we don’t get large numbers of users. Niche interests will only come up here when the population is so large that even the long tail ends up with critical masses.
Those defending “quality over quantity” miss this exact point.