Fact is I never used US dollar before March 2019 when I started to BUY Bitcoin and crypto. During the first year only, I bought with euro. But in 2020 and 2021, I started sell altcoins or Bitcoin to get stablecoins of dollars (USDC, USDT, BUSD, DAI). At some point, I had more USDC than euros in all my savings and bank accounts. With stablecoins of USD, it’s possible to get earnings easily which is not possible with stablecoins of euros or other fiat currencies. For me Bitcoin and crypto are also a way to make people like me use stablecoins of USD, even if they don’t need real USD in their lives.