If you want to buy drugs, ransomware, tax fraud (i.e. theft[1]), fake IDs, or have someone whacked, then you'll still use it.

So this only affects the single other use case, the legal one: greater fool speculation.

[1] before anarchist libertarians object saying "taxation is theft": Please don't start that conversation if you've ever used public roads, parks, or even passively benefited from the security provided by your country having police or a judicial system.

...or been to a public school, or ever interacted with someone who went to a public school, or, or, or.....

If you don't want taxes, you don't want society.

I mean, there's a few people that move to a cabin in the woods off the grid for that reason, which is fine if they want to live like that.

There's a lot of people however that want the benefits of society (for example to make money) without contributing back.