I have another example of forced DCC:

Went to get my tax-free refund at CPH at the Global Blue desk, which does refunds only by credit card. My refund was 17 EUR, they took my card and handed me a receipt saying I would be credited 17 EUR to my credit card.

Today, the refund shows up, but in CAD and not in EUR. (It is a 0% conversion Visa card), and the rate is a solid 7% worse than the rate I would have gotten with my card. At no point was I ever asked if I wanted my refund in EUR or CAD, Global Blue just did the conversion at their craptastic rates.

As if Global Blue wasn't making enough on their 50%+ cut of my tax refund, they also skimmed more off of my refund by using forced DCC.