Everyone likes to assume cryptos are the new laundering/drug/terrorist utility of the 21st century. But to anyone acquainted it's pretty clear that it's considerably harder to use them in general for such things. They promote transparency. It's not like carrying around a briefcase full of untraceable bills. Even when you can keep your situation private - rightly so - conversions in and out of fiat are not really conducive to covert activity since most are tied to Bitcoin (trackable) or require a healthy registration with law abiding institutions.
And the UK reports... cryptos are not being used for illegal activity that much. Unlike fiat since money came into existence.