The difference is that in the States a cash discount is only rarely offered. It’s common in some areas (gasoline often costs less when you pay with debit, contractors and other similar small businesses will usually pass that 3% on to the consumer as well) but not others. Much more common is that the business charges the same for both (basically every direct to consumer retailer charges same for both debit and credit).

The indirect result is that people with debit cards and cash payers are actually indirectly subsidizing credit card holders in the States. You’re actually operating at a disadvantage if you don’t funnel most of your spend through a credit card in the States