So as the admin of said groups, would they have the power to start deleting posts that they don't like/that don't agree with their POV?
Would they be able to kick people out of their groups?
I don't see this working!
Lots of closed groups, not alot else going on.
Lots of new cliques created.
Then you will get a thread where the sides are split, so off go the cliques into their little rooms to discuss it & bad mouth the other posters.
Maybe you will get threads where poster A argues with poster B. Poster A starts a group a few days later, poster B applies to join but A denies it as they argued about something completely different a few days previously!
Then lots of 'do you remember this & that' on the main forums, between posters who were in the same 'room'. Lots of 'in chat' to exclude other posters.
I can't see any good in it, tbh.
Sounds more like facebook groups, not private rooms!