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Amex is regularly rejected by businesses and cannot be your only credit card, so really you maybe have Discover.

I also wouldn’t say either of those is particularly better than Visa/Mastercard. They all engage in the same practices more or less

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The only places I've found that refuse AMEX are very small mom and pop operations. And of those, many don't accept cards of any type: cash only.

Fair enough, it's probably not as common as I think and is more of a reputation.

Costco?

[Edit] -- And I've frequented several independent coffee shops that are cashless.

Costco doesn't even accept Mastercard (credit cards), so they're kind of a unique case here where they intentionally choose to only accept one particular type of credit cards.

Guessing they have their own branded card that they push you to use?

Correct, and it used to be AMEX.

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