Most of the troubles an be avoided if you paying attention to the manger. You should not show hurry to join a campaign as soon as you become eligible, wait for one to be started by a reputed manager.
Famous managers are not guaranteed to get a good bounty. we still have to analyze the performance of managers.
disappointed with one of the managers and he did a great cheating.
No guarantee at all since they doesn't hold the funds of the investors and the only thing managers can do is to sympathize their participants if there's a scam happened. Maybe we should assume that always we cannot get a huge success upon joining on some bounty camps but lets define it as gamble and we may have a high chances to earn huge if our camp pays huge.