The issue is that a community on any platform is made by the average users, not the moderators. If you splinter a community into three competing communities, you will probably severely damage its integrity as a whole. It’s similar to the issue that some Discord servers have, where they tell people to take discussion from the main channel into different channels. More often than not, this kills the discussion because few people actually move to a different channel, with most opting to drop the discussion entirely.
A few people shouldn’t have complete ownership over something that exists because the people under them make it so.