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And as a result of that, Amex is often not accepted.

And is largely dying out as far as I can see; it’s only even still issued in a couple of European countries.

Looking at my spending in the UK, about 90% goes through Amex. Even the small corner shop takes it.

I only get cashback on my Amex, nothing with Visa or Mastercard; perhaps I could shop around but over 90% goes on my Amex so haven't bothered to.

At least in the UK Amex interchange fees are not capped like Visa and Mastercard.