There's bounty boards albeit for security bugs. I would love to pay for fixes if the maintainer determines it as a bug but can't fix it in at the moment. There

There's bounty boards albeit for security bugs. I would love to pay for fixes if the maintainer determines it as a bug but can't fix it in at the moment. There would be an issue of hiding progress work for fear of losing payment as you point out payment goes to those who finishes first. There's also some more issues.