The best thing I like about bitcoin is that it is pseudo anonymous and decentralized.
many mafia takes advantage of bitcoin on anonymous and decentralized so that they could hide from the law and the government bitcoin does provide confidentiality and freedom of the very real !
I'm sure before bitcoin created, the mafia has been doing illegal transactions using fiat. so this is not the fault of bitcoin, because the purpose of anonymity that provided is to protect the user's identity. but the most I like is the price of bitcoin that increasingly rising.