Well… I’d say it’s mostly like that. For example a socialist agricultural cooperative will be made up of farmers. A writers guild won’t necessarily welcome factory workers. They’re groups to pool resource but they share a specific common goal. In contrast to for example a central communist government which manages all the domains and all people.
But we have user groups as well. It somewhat all mixes but I’d say something like a Linux user group, the Ubuntuusers wiki or a repair cafe counts. And we definitely also welcome all kinds of people on the Fediverse. And we even try to accommodate them with whatever balance we managed to strike. Sometimes it ain’t easy…