Gitcoin has been doing this for a while now, crypto has had success in this model.
There hasn't been a lot of success with fiat platforms like bountysource.
I didn't discover bountysource until after starting on rysolv. But from their stats page you can really see the rise and fall of contributions on their platform.
They've been acquired a couple times. And I wonder if issues came from changing ownership / poor marketing. Or if OS funding is just inherently unprofitable.