I'm American. I went on a trip to Cuba for a free software conference, and someone from the conference borrowed a few Cuban Pesos from me to get some food before going to the airport. Later he sent me USD on Venmo for "Cuban cash transfer" and they threatened to close his account, but he managed to convince them that he was sending me money for lunch at a Cuban restaurant in the US. Ever since then, I'm cautious about descriptions when I Venmo people money.