If you're looking for trusted campaigns,then you'll need to work for trusted bounty managers and there are a lot of'em, just that most accept high ranked members only(at least from full member up and in few cases member rank) ,i am talking about the bitcoin paying bounty.
So if you want to work with an Altcoin bounty project,you can find a whole lot in the bounty section of the forum.
Be careful with most of'em,they usually end of being a scam,so be reserved on the amount of money you wish to invest with