Reward schemes are funded by interchange fees funded by higher product prices. They are a tax on the entire economy. Merchants can push the CC fees to customers who opt to pay with CCs vs cheap or free instant payment systems. T-Mobile has dropped autopay discounts if you use a credit card vs deposit/bank accounts for payment, for example. Walmart wrote public comments on this topic supporting the FedNow implementation.

Reward systems won’t last as merchants push towards FedNow as a payment alternative and charge you to use a credit card. Nor should they last.

https://news.ycombinator.com/item?id=36012866

> Walmart has observed a severe misalignment of incentives that has plagued the payments system in the United States for decades. Certain incumbents and large participants enjoy massive profits by stifling innovation in payments, ensuring that account access is limited to a small number of networks, and perpetuating barriers to entry for alternative solutions. Controlling this access allows the dominant players to extract rents from other payments system participants, ultimately resulting in higher costs for all consumers, particularly consumers who are unbanked or underbanked.