Oh no, I didn't even think about the possibility of power hungry mods lol
Communities splintering is going to be such a headache, and it's definitely going to happen. I get why people would want to make an instance private-ish by defederating, but the fact that people can still post but not see everything in different versions of the same instance - in my own opinion - kind of a stupid/stressful way of doing it. I feel like, if it's defederated, people who aren't signed up on that instance shouldn't be able to post. I feel like that would be so much more intuitive than creating diverging versions of almost the same thing. I could be wrong though, and we'll just have to see how it goes.