We have been looking at Bounty Source. We think jobs on Bribe.io will not be on that scale. Some of those projects are quite involved while Bribe.io may be smaller efforts, like updating a WordPress plugin to be responsive for mobile so it works with a mobile theme. It may just take an hour and earn the developer $100.
There may be some crossover with Bounty Source which could be good to provide multiple resources for users and developers.