Not many people are prepared to go into that stress of the kind of research you are asking for here. I know it is very easy for you to do as a bounty manager because if you do not do a thorough research and you make a contract with a scam project, everybody will accuse you of knowingly promoting a scam. This will affect your reputation here. But not many hunters and investors care about all that and they may not have that time for a vigorous research.
That's a problem right there. Many bounty hunters are too quick to jump in and join any bounty campaign they see as long as the payment is good. Not even thinking of digging deep about the project itself.
As I've said in a topic similar such as this, cooperation between the BM, bounty hunters and even the investors is crucial. Even if just one of them found a red flag about the project, it should immediately be published and announced for everyone to be aware and possibly save everyone's time and money from pouring it in on a possible scam project.