Bounty hunters are requesting to get paid through Bitcoin and Ethereum or other tradeable coins so bounty hunters will not dump their token when it hit the market, thereby protecting its price.
But they don't want that because they do not believe that their own token will have value or demand when it hit the market

and that's actually what's happening
That's one of the reasons I can think of if you have more post it here.
you shouldn't blame the bounty managers for that but should blame the project for not paying with other currencies apart from their own currencies. One problem I have figured out is that most of this projects takes bounty hunters for nothing and don't care how we feel about anything