These would not be countries per se, but more like a network of privateindividuals and corporations, who prefer to do business in high-quality gold-linked currencies.
Maybe some more sleuthy individuals employed private detectives like some film noir turn of romantic events, but for the most part, people had no way of easily snooping on their loved ones' communicative naughtiness.
It is one of the world's great shames that such abuse draws almost no attention, and apart from the efforts of privateindividuals operating at great risk, like Hae-young Lee or her North Korean interviewees, almost nothing gets done about it.