I think bounty managers shouldn't be blamed, how can they know, if an ICO is a scam or not. Bounty hunters have also got some responsibilities, they have to research well before participating in an ICO.
I think it's the ICO team, they are the one to be blamed. Bounty manager is a victim too. They are just too doing their job. We bounty hunters must be very careful in choosing a bounty campaign so that we will never be scammed again.