You could say, if you own the power source it's like a money tree. But that requires some knowledge in engineering and turbines.
That must be factored in, that some people have free power and relatively low costs otherwise. If china mining gets shut down, there will be people with free power who can take over.
It needn't be free. As long as it is cheap enough, there's profits to be had through mining. Cryptonoras enjoys energy costs well below the energy bills paid by Chinese miners.