It is very difficult to know the bounties scam, because there are no clear signs that it is a scam. I never thought that was a scam, at least we tried to follow the bounties, maybe we got a gift. This is only for our side income, which we must have a main job. I usually choose bounties from the project team and whitepaper. Team and manager usually determine that bounties are a scam or not. So we try to choose bounties first, see the team and manager.