[saalweachter]

USD aren't valuable because they have a fundamental value, either. Personally, I think the "you have to pay taxes in USD" argument is stupid; it doesn't factor into my daily thinking and I doubt it does to many other people's.

They're valuable because literally everyone I interact with treats them as if they were valuable. If that changed, I'm sure USD would quickly become worthless.

You can say there's no difference between USD and BTC, but there's some difference between "a million people think they have value" and "three billion people think they have value".