Those people may want to use that cash back to buy things on Amazon, save it for a rainy day in an emergency fund, invest it, or use it for a night out on the town.
Cash back credit cards are not like travel rewards cards. They are much more straightforward, allowing you to charge everything to the card and get that percentage.
Chase Freedom Unlimited is a fantastic card for cash back. Chase has increased the value of this card from a 1.5% cash back to giving you 5% on their travel portal and 3% for dining at the low cost of a $0 annual fee.
If you like food, then this could be the card for you. It has no annual or foreign transaction fees, so you can get 3% off all dining anywhere in the world—3% on all grocery stores (except for Target and Walmart).