Negative rating - If they were able to withdraw their campaign earnings.
Negative rating - Finding connections between them, regardless of them getting paid or not (based on those 3 users, all of them were active on similar boards ^{[perhaps threads as well]} + there might be other connections as well).
Neutral rating (+ placing them on your blacklist ^{[all of the campaigns]} for a certain amount of time) - If they never got to the point of withdrawing their earnings.