Why, there is value in crypocurrency. Maybe not the kind of value society actually wants. Crypto can be redeemed for drugs on the darknet. And you can use it to launder money, or to dirty money (taking your legitimate income and funneling it anonymously somewhere else).

Many cryptocurrencies have been ruled securities. Securities are not "currencies", but still have value, don't they? Even if it is just speculative value (you don't know whether the underlying business is goiong to be successful, or if it is even a scam).