That's true, but I think something like that should be the basis for both. Telegram has groups that require invites and groups that anyone can join at will, but they're the same underneath and in both cases these groups have an "owner". Now you only need to have a group like that (it's the default for most such style groups that exist today, for example, in

chachi.chat

vibe with your tribe

and a relay that allows anyone to join, but only if they fit some arbitrary anti-bot requirements.