Devs should stop blaming bounty hunters for dumping ,they work hard to promote your projects and they have every right to do what they like with the tokens if this is really what you don't want then
Don't pay bounty hunters in your tokens ,pay them in USD ,USDC or ETHEREUM to avoid dumping your tokens and that will have positive impact on your tokens ,dumping will always happen and if the project is a strong one then it will quickly recover
This would defeat the purpose of utilizing bounty campaign for community building. Also, it is counter-productive since the payment for advertisement could've gone to the development of the project.
Still, it is an undeniable truth that bounty participants have the right to use their rewards to whatever they may see fit. Also only a small part of the total supply is allotted to bounty so if there's anyone they should be blaming, it should be the investors who had huge bonuses during ICO phase.