I used to join bounty campaigns before where an escrow fund was set up to ensure the legitimacy of the campaign. I remember that there were many participants who joined those projects as they have a sense of trust that their hard work and effort in doing bounty tasks would be rewarded. But right now it is rare to see such a campaign. Having an escrow will really minimize scam projects and invite bounty participants again.
but when the escrow is in the token payment also that will be obtained by the bounty participant, the same will not change the risk that will be obtained by the bounty hunter. because the value and the future of tokens that will be received also no one knows. even after being registered in the token exchange from bounty, not many of them have good value.