I think that Bountyhive is not scam. Nowdays it is not simple to find successful ICO and most of BountyHive projects were not able to collect money, it is the main reason why bounty hunters are not satisfied.
And there're too many bounty hunters practices in the BountyHive platform, it makes the reward is fewer for everyone. BountyHive chose bad projects to run also, even they have a really good bounty platform.