Distribute reward with btc or ether, is already available since years ago.but those are very few & can't help preventing bounty scam. If we have a look at bounty thread, most of them are scam, some are totally garbage. good projects are a few.i notice, some newbie manager with 1 activity post scam bounties to scam our fund.even though newbie hunter continuously joining with them & promoting scams, that should be stopped. Using escrow might be helpful to solve this problem
Campaigns do not want to do that because for that you need money, they want to distribute their tokens instead, that way they do not have to use their limited financial resources on paying their bounty hunters, and what is even worse is that when the coin crashes they are going to blame that on the bounty hunters so while for us that is terrible for those developers this is the perfect excuse, so they do not have any reason to stop paying bounty hunters with coins of no value as long as bounty hunters keep accepting those conditions.