It is really hard to detect scammed bounty campaign. After completing all the requirements to be able to get accepted in a bounty campaign, spending much time to participate in forums and not to mention carrying their banners, completing all the tasks and reports then all of a sudden you will just find out that you have been scammed already. luckily I am not the only one but to think all participants did the same efforts as well as you did. But it is really happening, lesson learned and could be just charge it to experience and move on. If we could only find out at early stage if we were in to scam or a legit bounty campaign. Who would really know anyway?
You can see, market is so vulnerable to those scam projects that is implemented day by day. They look like legit also in some ways that it is very hard to know whether they are real or not. But the thing I've noticed is, if the project's team is anonymous, then you can smell something out there. Be cautious.