I first became aware of this when I was contacted by an electric utility that I occasionally do work for. They were approached by some of the "bitcoin miners" who wanted to install buildings full of computers using vast amounts of electricity to solve complex equations. If they were lucky enough to be the first to solve the equations, they would be rewarded in bitcoin as payment. That is basically "bitcoin mining" in a nutshell. Since that time I have done some research, which just makes me shake my head in disbelief. It sounds unreal, but this is already going on at many locations across the planet.
My advice to the power company was to not give them anything free and even make them pay ahead of time for removing all of the facilities that had to be installed. It's amazing when we use real, physical resources to create something that doesn't physically exist.