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?
For me we need to regulate the crypto because if we have done something to it we can have something to hold back and if we introduce it to other people they will believe on you and they will not think twice cause it is regulated already. But if it is not yet regulated we will have difficulty to introduce to other cause they will not believe on you.