Tell that to the Venezeulans who used bitcoin because their local currency is suffering from severe hyperinflation.
https://www.bbc.com/news/business-47553048
https://finance.yahoo.com/news/venezuela-bitcoin-story-puts-...
I've personally used bitcoin to send money between my brother and myself (he was in Australia at the time, I was in the EU) because it was both faster and cheaper than a bank transfer or western union.