Sometimes I wonder whether criminals have established their own specific cryptocurrencies, because even criminals need to trade favors for favours.
But then again, using bitcoin or any crypto would be pretty dumb as a criminal, since with the wrong leak could trace you to everything that you've done with time stamps and possibly even locations. And you'd never know what was a honeypot, especially because you'd be dealing with criminals (and probably dumb ones).
The openness of bitcoin may actually help lower criminality over time because of these features, and make politicians more accountable to their people in more than one way.
I don't think bitcoin is more used by criminals than other currencies.
Drug dealers always used cash, which is a lot more anonymous and untraceable than bitcoin is. There is a good TV show about this in Netflix, Narcos. This series tells the story of Pablo Escobar, a Colombian drug dealer who built an empire selling drugs in the united states.
He used only USD cash. In the TV show you can see he receiving millions and millions of dollars in cash. He couldn't even handle so much money, then he even started burying money to use later on!
Criminal activity has nothing to do with BTC. Criminals will use any kind of currency.
I first heard about bitcoin when I reading about privacy online. After a few days, i discovered an article saying that bitcoin was a good currency for privacy... I couldn't stop reading about it since then.