The upper class or more technical user will use decentralized exchanges, non custodial wallets, cash out by sending to cuevas or wallets abroad.
If they ban cryptocurrency exchanges it will just hurt the average middle class person. It will hurt the country from a technological standpoint too. Crypto is web 3.0 - decentralization of applications and financial technology. One of Argentina's bright spots is they have a lot of talented computer engineers. They should embrace it, but I'm guessing they won't.