[pantaril]

You usually don't know if the address is known drug site wallet, dark markets usually generate unique address for each transaction. Even if you do know it, you can't know if the user bought something illegal, there is also legal stuff sold on dark markets. Keeping everyone legal interests in mind means that you don't give personal data to police or anyone else without proper warrant.

[yAnonymous]

The article mentions the specific site and it seems to deal only drugs. They don't keep the money at the generated address, but transfer it to another wallet I suppose?