"What should I do if I see an organization of people getting too big?"
Difficult !
Is it popular ? For what reason ?
If popular for Harm it is probably time to move elsewhere.
You're going to be a lonely nomad you're whole life then. People get together to do stuff they couldn't do alone. If it's valuable but has been corrupted I think fixing > abandoning
A mostly lonely nomad my whole life already. Nothing new there. Populations do not often cooperate with being fixed. Sometimes letting Darwin deal with it is the only solution.