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?
We know that it's hard to identify them. But there some aspect that we can detect them, first is by looking the design of their website together with the team specially its developer. In addition, looking also community and social media. Other thing is their roadmap and white paper presentation that mostly attract us. So we should always be careful.