Even starting small isn't a surefire way to avoid that problem. They'll just show up once the thing gets big enough.

Witness how the web was once a funny little collection of nerds sharing stuff with each other. But once it got big enough that you could start making money off it, the important people showed up and started taking over. The web still has those odd little corners, but it's largely the domain of a small number of giant powerful corporations.

I don't think there is a silver bullet for dealing with egomaniacs who want infinite power. They seem to be a part of the human condition and dealing with them is part of the ticket price for having a society.

Dunno if you listen to Ezra Klein but he had an anthropologist on once who described this tribe of humans who when someone came back having bagged big game, they had to run a gauntlet of everyone else downplaying their accomplishment like "that's not that big, your father caught bigger", and "maybe one day you'll bring down an adult deer" etc. The whole idea was like, egomaniacs are pretty bad, and they had a cultural defense against it.

I often think a weakness of liberal, western society is the insistence on rationality, that like the hunter in question could just easily put their abilities and accomplishments alongside those of others and get a pretty accurate picture. This is super untrue; we need systems to guard against our frailties, but we can't admit we have them, so we keep falling into the same ditches.