Bounty campaigns are very risky yet if you happen to be in one of a good project, it will give you good amount of cryptos.
I just think that no one can really tell if a bounty project is good or a dad one. Any campaign could be a scam and I think most campaigns only focus on selling their coins to have enough value.
I guess it is really seldom that there is a project that pushes innovation and convenience.

But in the forum, as an experience, always check the company's background. If all people look very accountable and reliable. There is a complete profile and papers about the project and goals.
There are specific guidelines that somehow will hep you avoid scams that is for sure. So have precautions.