Even you will ask the bounty managers the question you are posted here they can't give you guarantee that there answers may be applicable once ICO is getting over as we are aware that there are always a disclaimers in bounty rules that bounty managers and admins has the authority to revised their rules anytime they want. And this really give headache to bounty hunters.
This is one-sided protection that would nebylo pritenzy. This is the oral form of the contract and we cannot do anything about it. It is a pity that sometimes companies refuse to pay hunters.