Originally Posted by tmiw

It's easier in an EMV environment though because there's no need to keep a BIN->country association list constantly up to date; just check the Application Currency Code on the card. Also, it's probably not prevalent now because a lot of businesses have some really old terminals that probably can't even do it in the first place.

Then again, it's probably way easier to enforce proper DCC here than elsewhere so even if it does become more prevalent at least opt-out should be easy.