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
This year in altcoin section, I have only just seen Injective as the only project that pays ETH for bounty in a relatively decent amount (30k USDT). But it seems like we have only seen such a project this year. Very few projects use escrow, we don't have many options, so it is necessary to DYOR.