Solvable with a combination of robustness and stochasticity. If you say need two randomly selected people to approve an edit, and you flag users who make too ma

Solvable with a combination of robustness and stochasticity. If you say need two randomly selected people to approve an edit, and you flag users who make too many attempts at making rejected edits (either one user, lots of bad edits or lots of users trying to make the same bad edit), the only way for a bad actor to reliably make undesirable edits would be to gain control of a very large number of potential approvers. More generally, if the cost to effectively manipulate the system is greater than the perceived reward from manipulating the system, bad actors aren't an issue.