I think this could possibly work with other things of (minor) value to people, but probably not plain old money. With money, if you tried to fix the incentives by offering a potential monetary gain in the case where reviewers agree, I think there's a high risk of people setting up kickback arrangements with reviewers to scam the system.
And if you think you're being smart by gifting them money or (more likely) your "in-game" currency for "good" reports, it's even worse! They will game the system when there's money to be made, who stops a bad actor from reporting their own poison? Also who's going to review the reports and even if they finance people or AI systems to do that, isn't that bottlenecking new models if they don't want the poison training data to grow faster than it can be fixed? Let me make a claim here: nothing beats fact checking humans to this day or probably ever.
You got to understand that there comes a point when you can't beat entropy! Unless of course you live on someone else's money. ;)