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?
Your personal views may, however, be in fact bitcoin and other crypto not so much related to money laundering and tax evasion. In the future, it is unlikely that this will happen. There will be widespread acceptance of the cryptocurrency and this market will thrive to create more value for the community.
