Heat has a quality scale … high pressure, high temperature, high thermal capacity heat (steam) is the best. 

Low temp, low pressure, low thermal capacity (ambient air) is poor quality.

Some of this is just thermodynamic fact … poor quality waste heat doesn’t generate electricity cost effectively.

Bitcoin mining is about the cheapest sources of electricity. The difficulty adjustment eventually punishes expensive sources of electricity applied to the network.

TL;DR - bitcoin does NOT fix this 

 Meh quality can depend on perspective 

 actually, no ... this is thermodynamics. there isn't "perspective" in thermodynamics 

 Thats what they all say ;)😎