It's hard to say, but we should only participate in bounty campaigns with known bounty campaign managers.
Bounty managers are not at fault here, they should not be accused without proof.
Even reputable bounty managers can become a victim of a scam project. Bounty managers are just doing their job to manage the bounty campaign and if the project turns out to be a scam, it is not their responsibility to face all the blame from bounty participants.
Somehow we need to see the past experiences of the bounty managers if they accepts scam projects before, know that failed projects and scam projects are different, I still prefer to join in bounties that also researched by the bou ty manager does they know how to explain the projects product and can explained well why the project failed maybe due only to market performance now and fear from investors.