it's true that bitcoin is being used in many bad sectors but literally why would it stop. bitcoin is a kind of money and money can be spent/transfer anywhere in the world in exchange for some product or any service. bitcoin is also used by deep web and most probably for all kind of crimes. we can see the recent ransomewhere attack which also demanded Bitcoin from common users.
Anyone is thinking that bitcoin is widely used in many criminal activities because they are thinking that bitcoin can protect someone's identity making it an "anonymous " money. But the truth is, it is not.
Bitcoin may be pseudo anonymous, many people told us that these digital currency can still be tracked. And just last week, I've read an article about these. Here is the link.
www.cryptocoinsnews.com/terrorists-and-criminals-are-rarely-using-bitcoin-or-ethereum-eu-study-finds/amp/