I am personally of the opinion that China swiftly killing off its cryptocurrency mining industry overnight would be to the great benefit of humanity. The sheer amount of electricity it wastes is an environmental disaster.
Agreed. Shutting down participation in the planet's largest pyramid scheme doesn't have a lot of downside.
At best, trading these currencies is a zero-sum game where you take money from others without providing any intrinsic worth to humanity. At worst is a pyramid scheme plain and simple.