I'm yet to understand how the project will get to pay participants of their bounties with BTF.
What OP is suggesting is that projects use those BTF tokens as payment to the forum. Once they pay a required sum to the forum, they will be allowed to announce their project and receive the right/blessing of the forum to carry out a bounty campaign from where the participants will at some point in the future be paid. So the BTF tokens wouldn't go to the bounty hunters, they go to the forum.