If I provide a service for someone, I'd want to be paid with something I can immediately exchange for fiat, be it Bitcoin or whatever exchangeable altcoin.
People working for worthless tokens bring failure onto themselves, that's not how you run a successful business.
With new clients, I demand payment upfront, there's literally no way that I get scammed.
If the client is unhappy with my work, I'd just resolve it (not that that's ever happened).
Why should bounty hunters work differently? Why do you accept to get paid in worthless tokens?
Why do you work for projects that can't even afford to pay for promotion?
Yeah that's the thing. For most of these bounty task, you don't even need to have any sort of expertise, which in turn attracts people who have very little skills.
It's in everyone's best interest to just not join any of these projects, basically for a promise that you'll get paid.
If you can find projects that are willing to just pay you for your work, I'd recommend joining those instead.