As much as I love the power off blockchain technology, it's likely just a matter of time before a blockchain is created to facilitate these types of market trades which is virtually impossible to shut down.
Either way they can never shut down these types of platforms eternally, they will forever keep popping up.
Like a steemit but for drug etc. Interesting.
Meh. People are always going to use untraceable currencies for illicit purposes. It's not the problem of the blockchain community, if we crack down on it they will just use something else.