For me the bounty manager is being paid a nice reward (and probably skimming the top) so they should be held accountable for scam bounties. If they can't get the job done I'm sure others can. Tossing the bad managers is the only way to progress. Sounds harsh but all this niceness is why we are in the mess to begin with.
and what does the manager have to do if the administration decides to throw their hunters? he certainly can intervene, but he does not make the decision. The manager is to blame only in case if he knew that the project was not honest