I don't see how bounty scam will gradually go away because not all project team are sincere or have reputations to protect, this have make bounty hunters to have less respect in crypto space, new projects seek for bounty hunters to create awareness for their new projects but when it comes to paying they show their real colors.
So you can see because of their these scams now their projects are failing one by one, if they will be sincere with their promoters and will pay what they promise, then in the future people will trust projects and all of the projects will get success.
The only solution to bounty scam is escrowed and this is only what good bounty platforms or bounty managers should introduce to atleast limit disappointments of not getting paid
Yes they have to escrow but to make sure that they escrow in BTC or any other coin which is actively traded on good exchanges as many times they pay in their coins but they do not list their coins and the bounty hunters do not get for what they work hard. So they have to escrow as a security which will be returned after paying to bounty hunters successfully in their tokens and the tokens are listed.