I don't think so but to my mind the answer is obvious because the number of scams has increased. It is difficult to define who is who. That's why a lot of people think that it is necessary to be careful with everyone
Not everyone is a scam. We are capable or the one responsible on what we do. So we must be careful on choose what ICO projects to invest with and in what bounty campaign to participate with to avoid scams.
In the reality, we can't predict if the bounty campaign can go for a scam or a successful project because it is not like investing that you will spend a lot of time studying the campaign because you can be like the other people who are just joining and joining and if you will ask me what is the best thing to do is to join to those campaign manager who are already have a lot of experience to managing a campaign because they will choose good projects for sure.