I imagine DCC is likely common in the US. The ubiquity of USD denominated cards in everyday transactions prevents most of us who contribute to this thread from ever seeing DCC in the US.

Mrs. Majuki only had - it expired - one non-USD debit card, but since there was a non-zero FTF, there were no rewards, and she keeps an immaterial amount of cash in the linked checking account, she was never interested in using the card to check for DCC. We didn't try Walgreens though!

This was a customer service gesture on the part of Chase. When they do a full chargeback it takes a month or two to resolve.