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?
We can regulate it but not in a centralized way. That is why they have created the blockchain and every hash of it is secure. Nonetheless, the market is still down for this moment and it does not need any more regulation. People will find it hard to regulate crypto because they are very volatile.