Some are even worse than this. When I was in Portugal, the machine said "Press (1) for GBP. Press (2) for EUR.", then on the next screen, after you select "(2) for EUR", it says "Rate will Apply. Please confirm. (1) Accept conversion (2) Reject Conversion". If you select "Accept conversion", it overrides your currency decision and you pay in GBP with their markup fee...
I saw the same in an ATM in Greece. The first screen wanted me to let them convert the currency (at a 20% markup), I declined, and the second screen said "are you sure? You might be charged a lot" and had "accept" and "decline" where the small print said "do you want us to convert anyway?".
It's a complete con...