Yeah. Bitcoin and eth payments can guarantee bounty hunters to get a good payment. If the bounty manager holds the token fund, it means that the bounty payment will be guaranteed. But if the project is scammed after the bounty, then there will be no benefit in getting the payment for that project. Because if that token is not listed on any exchange, Bounty hunters will not be able to sell their token even after receiving payment.
The bounty hunter's reward lies on the trustworthiness of the developers and the potential of the project, if the developer is not trustworthy they will hold and lock your token until such time that it is ok to unlock, I have seen token locked for nine months and some developers intentionally forget the rewards of the bounty hunters.
And second if the token has no value when it hit the market or there is not enough liquidity, even if the bounty hunters got their token it's useless and bounty hunters just wasted their time, bounty hunting now has a lot of risk only those who are dedicated to this will stay.