How often are you scammed for bounty rewards? It's no surprise some devs are scamming the bounty hunters to save costs. It's always upsetting to do a good work and finally this time is wasted if the devs don't send tokens. Scam means if you don't receive tokens at all according to the initial rules when you joined.
How often were you scammed in the past considered in percent of all campaigns? How many were paid? And do you have an idea to avoid it?
Just try to put all of your effort on the good bounty remember you can try to identify which is a trusted developer and which others were not.
I can say it becomes your responsibility to join in the trusted bounty platform. that means you can try to say that as your effort to save your works.