That's the same game though: if I know a guy who can get me weed or whatever, I will know a guy who can get me bitcoin.

And since there is no physical product or evidence it's actually much easier, my friend from Amsterdam will have a lot of trouble bringing me weed, he will have zero difficulty sending $100 worth of BTC to an address I give him.

The idea that you can just ban things and they will go away should have died with alcohol prohibitions. I guess at least no one will get killed in a war on crypto...