For developing economies with unstable currencies, does Bitcoin add anything to their current currency situation? Many countries, for example, use black market

For developing economies with unstable currencies, does Bitcoin add anything to their current currency situation? Many countries, for example, use black market US Dollars for transactions. It's not clear yet if these countries with limited technical infrastructure will see a win of Bitcoin vs. USD cash, at least in the short/medium term. Sure, BTC might win out of Argentinan Pesos, but it's certainly harder for the average merchant in Buenos Aires to accept and transact using BTC vs. paper USD. The barrier to entry to accepting foreign USD for transactions is 0; for BTC the entry is more difficult (currently).