There is a limited supply of U.S. dollars in a country like Vietnam, which naturally limits its use in illicit trade. Both paper money and cryptocurrencies have

There is a limited supply of U.S. dollars in a country like Vietnam, which naturally limits its use in illicit trade. Both paper money and cryptocurrencies have to be converted into "clean" money that can be deposited into banks to pay taxes and expenses. While paper money requires expensive and potentially dangerous laundering operations lest you end up with warehouses full of bills, you can hold crypocurrencies in a wallet for no cost until its needed to be laundered and exchanged for real income.