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Not anymore. They removed the rule in 2013 after they were hit with a $5.7 billion antitrust settlement.

They tried and got absolutely hit hard by anti-trust and legislation in the US and Europe. They no longer try.

The same is pretty inevitable for Apple at this point.

This is about telling the user that Mastercard is charging you a fee.

You can in the UK

Not in most cases, since 2018.