Digital currency is to change the world, many of which were positive, to a certain extent, they pose a containment of the government, gave the people an alternative, but that doesn't mean they don't need to be regulated.
One of the core reason is: anonymous, do not track, not regulated digital currency will make form a closed loop technology crime, money laundering and terrorist, and disappear from unsolved bits, bytes, while the impact damage with each person in this world.
If every penny of extortion is tracked, is there enough motivation and courage to launch a WannaCry to attack the world?
Yes, bitcion needs a regulation for the prevention of illegal activities like scamming, money laundering and terrorism. Because digital money currency is decentralized and no one obliged to blame if there is a problem that happened. And this regulations also protect the good reputation of digital money currency.