Gold is not used as money because of its lack of velocity and weight.

Let's say you sell chicken. Your cbdc inflates by 10% a year. But there is another form of money that doesn't depreciate.

Which will you take?

Look at what's happening in countries like Argentina or Venezuela. You can see that people prefer the dollar. There are black markets for it.

And I'm not saying that's going to happen soon. But if bitcoin can scale and avoid bugs and avoid being captured in one way or another, bitcoin will win. And then you'll have people who will only accept btc.