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, regulation is definitely needed. As there are no laws and regulations in the crypto market, anyone can open an ICO just to rob the investors off their money. Day by day scams are increasing. And there is no one who can look over this entire issue. Under such circumstances regulation is the need of the hour. This can also guarantee the minimum value of the cryptocurrencies.