I think that this initial point is the first indicator that the campaign is likely can be not fair and only if you consider the project is very good then you should join it.
Right, if you have seen such rules like that then simply don't join because everything can be changed according to that rules that has been made by the bounty manager. So don't look for fairness if you have already read that they are implementing that kind of rule.
But if you guys insist to join, know the consequence and you are all taking the risk. Expect that at the end of the bounty there will be some change and you don't have to blame others with that mistake if you're aware of the change of rules.