[handrous]

That's the part that makes it only marginally better than just counting on them to manually forward the money. The only advantage is you skip the part where they already have the money but have not yet betrayed you, and are looking at a huge figure already in their own account and maybe contemplating not sending any of that to you. They can still just have it sent to the wrong place to begin with. Since it'd be easy to fake fulfilled contracts (make sure you own all addresses the contract disburses to) completed contracts, even if publicly visible, aren't even very good for building a reputation for paying out. You might just be paying yourself at multiple addresses, to make it look like you reliably pay out rewards.