Yeah it is definitely a problem for project developers if they have to send hundreds of small transactions to the bounty hunters every week. It's very likely that the fees are higher than the actual transaction value in that case. Maybe it would be a good solution, to send only 1 transaction at the end of the bounty instead of small transactions every week
But it may cause trouble in terms of the rules they have been created unless there is a group chat that participants were included and inform well it can be fine especially if its a reputable company,many participants will understand it if they will make changes in terms of schedule or changing the coin into usdt or other alts to avoid too much fees on their side, the only good thing is for bounty hunter that have chance to acquire more crypto before the price went much higher.