This isn't true, in our world today we don't only have bank transfers and crypto wallets as means of sending and receiving cash. Since even before Bitcoin was invented there other businesses such as remittance centers like Western Union which is a good alternative for banks during that time, I believe this was the preferred option by friends and relatives who want to send money overseas. Other than remittance centers there are now wallets apps from big companies like Samsung and Apple and also Paypal which also have a global presence with their service so if you are thinking that bank transfers being banned theoretically will boost the price of Bitcoin then think again because there is a lot of alternatives that will come in mind first for these people rather than seeking cryptocurrencies as a alternative.