From a person pursuing the bounty perspective, there are some unknowns like - who else is working on this thing? Am I wasting my time? What if they “beat me to it”?

I’ve had a few people talk it up with me only to not really take it anywhere because they thought the bounty would have been completed by someone else, except it wasn’t.

Then some people saw some other marketplace-ish ideas, and thought it was done too - but none of those things met the requirements (not even close).

Besides this, I am not sure if bounties can inspire the right level of commitment needed to complete them. Maybe small bounties, sure, but larger projects tend to need more organization and cooperation vs competition. You need a team of people to tackle them, but that means they also have to be worth it (larger than what they typically tend to be in payout). It ends up being too much work for 1 person and not worth it for teams of 2+

At least that is my assessment.