It is not easy for Bounty managers to predict scam. It is better to talk to Bounty manager ad make a solution by which you can contact team of ICO , if it is scam then take help of bounty manager and raise voice against ICO team.
For me we to understand bounty manager if the project is scam. Its true it is difficult to know scam project maybe this is a matter of team work. Instead of blaming managers team members should also help to research the project they are working then advise immediately manager and ICO if found that the project is scam.