Dictatorship had a pretty clean run of several thousand years there. Sure, dynasties changed, but never the actual system.

Also, consider the attractiveness of dictatorship. I think that everybody would like to be a dictator. Who wants to share power? Not me. I want to be in control, of my forum, my project, my game.

So, my second paragraph kind of addresses that. It's never actually about one person having the power, as a government system.

One-person control over something, backed by externally imposed laws, is a completely different thing. You don't have to worry about your forum members poisoning you and physically taking control of your server.