In the beginning, this isn't largely a problem because the owners of the site can manage the load. Then as the site gets marginally bigger, you can trust on volunteers who have demonstrated expertise or something.

But eventually, skilled people will get busy. Owners/developers will need to manage the business/code of the thing. Your expert volunteers will have jobs and obligations to fulfill. Between them, there won't be enough manhours to manage the community.

The worst thing to do is to put it in the hands of those who have dedicated the most time to the community. Why? Because there's a reason they have all that time to dedicate to the community. And hardly any of them are good. But that's what most places do. And then they essentially become places of pointless bickering and mindless politicking. Basically digital HOAs (to reference a recent article posted here).

The people responsible for managing the community need to be compensated for doing exactly that and they need to be either trained or vetted to do so. Self-selection in this regard is probably one of the worst ways to go about it.