I think it will be more preferable to have rewards paid in bitcoin or ethereum in order to save bounty hunters from receiving blames unnecessarily.
I will say it many times already and will say it once more, the team doesn't have initial money to fund their project that is why they are launching an ICO to fund it. One thing more, they don't want to risk their own money into a project that is not 100% successful. We know that some of the projects right now are either scam or doesn't reach their soft cap ending in abandoning it.