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?
Digital currency is fairly new to the public and it definitely needs some rules to hold it in place and for it to be a norm. In the event that the administration won't control digital money, it can be an apparatus some time or another to make a war and will result to a contention in our general public.