A very big percentage of credit card expenses in the US come from cards with rewards programs, so you get money/gift cards/travel discounts in exchange for using the credit card instead of the debit card. A lot of this is funded from much higher interchange fees: It's ultimately the merchant you buy from funding most of the rewards. Since those very high fees are nowadays illegal in the EU, European credit cards cannot have this kind of generosity, and incentives are very different.