Poland has been among the worst offenders for DCC for the past 4 or 5 years based on the reports here. There's certainly a self-selection process on FlyerTalk, but the country comes up frequently.

For instance, I just got back from 5 weeks in Australia. While DCC is definitely present in Australia these days, I never saw it by tapping my payments 100% of the time. I either used points or paid with Amex for hotels, so I didn't see DCC there either.