Argentina. For many reasons, Argentina is one of the top countries using crypto, particularly USDT, for a lot of transactions.
There are many factors. First of all, the capital controls and exchange rates. If you receive money from abroad, you get paid, in pesos, less than the "real" value. This happens because the government sets an artificial value for the peso, but it also makes it illegal to exchange to pesos. So the only way to get dollars is going to the black market. And the rate there is higher (used to be 100% higher, now it's around 35%)
Second, the whole system of "sending and receiving money to and from abroad" is designed for companies. If you're a freelancer making, say, $2K a month working for foreign customers, it's prohibitively expensive to receive money. Some banks can charge nearly USD 160 for an international money transfer. Paypal isn't allowed, and the local equivalents of paypal only deal with pesos. Other companies such as Wise provide minimal services to Argentina.
Notice that everything I mentioned is "before tax". Someone making 2K a month is already paying income tax ("rich tax"), and most freelancers make over 3K a month so they're already being hit with the full rate of 35%.
So what people do is just crypto it. It's already illegal to get paid in crypto (legally speaking, you're obligated to exchange your dollars to pesos at the central bank - your bank does it for you), so if you're doing crypto you're already doing a criminal offense. Might as well evade tax while you're at it.