From the article:
"...That system makes it possible for police to trace users, whilst exchanges offer centralised areas for law enforcement to raid and find out who is making dodgy purchases with the so-called 'crypto-currency'."
I always roll my eyes when an article uses the phrase "so-called" to demonize something dimly understood. I fantasize that it says "...That so-called system makes it possible for so-called police to trace so-called users, whilst so-called exchanges offer so-called centralised areas for so-called law enforcement to raid and find out who is making so-called dodgy purchases with the so-called 'crypto-currency'."
I like your Goldilocks quip!