It works until trolls figure out how to prove they are not trolls, even though they are trolls, while non-trolls have difficulty proving it.

I suspect that the energy required scales exponentially though, and, eventually, it might just become less of a hassle to just behave.

That and the fact that each increase in difficulty filters out people that do not have the capability to pass it. So the pool shrinks every time.

Though, valid counterpoint: Eventually prefabs emerge and get shared.

But then we innovate once more. We always did. We always will