But it's kinda kickstarter in reverse since you have people wanting to give money but no one picked to do the work. It's a bounty.

I worked on and almost launched an open source bounty site a couple years ago. But the closer I got to launch the more I realized that I hadn't adequately solved all of the hard UX problems (mostly around a: picking who's going to work on it, trying to avoid both having two people separately do it due to know central coordination and having one person say "yeah, I'm going to do this!" and then not get around to it and hold the project back, and b: how to handle it when someone does technically address the bounty, but in a way that is unsatisfactory either because bounty-placers did not perfectly state their needs or because of poor quality.