At present I do not trust any manager.
if you read the instructions as below.
Disclaimer: I am only the Bounty Campaign Manager for this project. I am paid only to manage this bounty campaign. I will not be held responsible should the developers/project team fail to reach their stated goals/obligations to the bounty participants, investors, and everyone else.
Join (on this bounty campaign)or Invest (on their ICO/IDO/IEO) at your own risk.
Obviously, you don't need to trust any Bounty manager, participants and managers are both paid by the company you want to promote, the fault here is not the manager, but the company if they don't pay.
Conclusion: if you want to join the Bounty campaign, don't look at the manager, look at the team and company, every participant doesn't need to trust the manager all you need to believe is yourself sure to join, hesitate to back down, no one is forcing, everything is free.
But if the project is obviously a scam or there are pieces of evidence that the project is a scam the manager must act to stop the campaign, a good manager will not hesitate to do that and is not selfish even if he is going to get paid with tradeable coin,
If you're a bounty hunter you need to set criteria on the kind of project that you're joining, don't join for the sake of joining work smart not harder, you don't have to join everything you only have to pick the right one.