Very few BM does that. Maybe yahoo62278 and Hhampuz do that if I'm correct. I used to have my own criteria but sadly I would never be able to a single bounty to manage if I were determined on that standard. Also, if I'm not managing a campaign, there are hundred more managers to do that job without thinkiong twice.
I've alerted 7 BM about Partyland scam. 4 reviewed the proofs and didn't start the campaign, 1 cancelled the ongoing campaign and 2 banned me to keep running the campaign.
Sometimes even all the proofs given is not enough (they didn't even have to do the researches).
For those 2 BM, having been paid was enough for them to continue the campaign, and they clearly mentioned that they are not in charge or responsible of the distribution for the hunters.
They are either desperate to find a project to promote or are using hunters to make money.
In both case, hunters should stop participating in their campaigns. But they still are even when they are aware of the problem..