they have nothing to blame because they have to set tasks that they have to fulfill and they do them, they can also be deceived by employers
We will never know the whole truth, and whose initiative it was to break the trust of the bounty hunters or change the rules midgame. I wouldn't search for the one to shift blame on, I would try affecting the market leaders so that they invent the mechanism for regulating the ICOs and punishing the scammers.
Yeah, bounty managers could get involved closely to the pool allocated to be distributed without us even knowing, and I bet there are other things that are hidden from the bounty hunters too.