This is an issue that should be attended to . Bounty managers should always have it that they need to assist hunters to get what their reward is. Some developers have taken from hunters what their benefits are.
There are some points that should be tackled about this...
1. Ensure that rewards are distributed before they go into exchange. This is because when the coin goes into exchange and starts performing and increase, developers find it difficult to redeem the promise. Dego bounty is an example on that.
2. Always have a good bargain protection for hunters so that no matter what, the reward will go to the hunter after the bounty.
3. Suggest payment in valuable altccoins because protection of workers should be important to any company.
Bounty is not a job and the bounty managers are also same like bounty hunters who stuck with such problems as long as the bounty team decided not to release the rewards for their bounty team.
Bounty managers should be responsible for this?
Definitely not, in my opinion because everyone join into the bounties knows the risks so they should be prepared for it.