Have you any source on the fact that they charge more because of this? Interchange fees are capped in the EU, and the amex fees document based on my reading of

Have you any source on the fact that they charge more because of this? Interchange fees are capped in the EU, and the amex fees document based on my reading of it (it's hard to grok) seems in line with the visa one. Also, from my link it's not just amex. Most of the supermarkets have MasterCard rewards cards, and a few of the "new" "banks" have rewards/time limited rewards (e.g. Chase, curve, revolut). So no, it's not only amex, and yes these schemes exist in the UK.