The article discusses the anatomy of a credit card rewards program, explaining how credit card issuers compete for customers by offering rewards, and how interchange fees are set based on the type of card product. The author highlights that not every card is a rewards card, and that different users have different needs and jobs-to-be-done for credit cards. The article also touches on the complexity of rewards products and how they are designed to attract specific types of customers. The author notes that the system is complex and influenced by various factors, including socioeconomic status and spending habits.