The fear of dumping often makes the project team fear or avoid the payment of hunters until sometimes after the exchange listing. I wonder why the team make themselves restless on an easy thing like that when they can easily conduct their bounty with bitcoin or ethereum for payment. That will safe them of the fear that the bounty hunter will dump after the exchange listing.
Bitcoin and Ethereum are already their profits, they cannot make a guaranty that their token will have a value at all in the market and at the price they want on it, if the project is a scam, they can always leave the project and take the profit with them, that is the sales of their token.