Have you ever wondered where the money comes from to pay you the cash back? It's from charging higher merchant fees for rewards cards - so it's just a shell gam

Have you ever wondered where the money comes from to pay you the cash back? It's from charging higher merchant fees for rewards cards - so it's just a shell game really. If merchants can charge a higher excess for rewards cards, that will help level the playing field. It's a shame AmEx isn't included in the deal.