It's a very "first world" problem. Maybe it would work in the few rich countries the world has, but as someone who lives in a region with the median monthly income of under $300, I can assure you it would be difficult to extract anything over $0 from most of our population because people don't have money to spend on things that can be obtained for free. Many people I know have literally zero cash by the end of the month after all necessities are taken care of. AFAIU, most of the world's population lives something like that, a bit better here, a bit worse there, but still.