If you are referring to the services being a scam then, try to find a bounty running by TokenMarket, BountyPortal or reputable bounty managers on the forums but If you're speaking about the members impersonating other members then there isn't much that can be done here. If the manager is vigilant, that shouldn't affect the original participant in anyway.
Thanks for the tip, and ill try to follow this managers. if i see some of their bounties.
And yeah i wish the managers are vigilant, but i cant blame them that much. cause of the volume of participants is quite hard to manage.
but yet its really annoying