We do occasionally see a small surcharge in the US when using a card, but that’s regardless of method (swipe, insert, or tap). Very small businesses will often charge 1-5% for any debit or credit purchase, and cash price is the listed price. But again, that’s not tap specific
Can you explain how to do this? I’d make the switch, honestly. Not a super techy person, but I’m willing to learn if it means a Linux phone.