If the bounty managers are rewarding the bounty hunters with real value coins, it would certainly prevent the possible dump thats gonna happen. Because they would not panic sell the tokens that they got.
There are still dozens of ICO projects that are heavily dumped when listed exchange. That's because from the time ICO to the time of token was listed on exchange, the price of Bitcoin and ETH was greatly reduced, the dumped token was not entirely dependent on bounty hunter.