We are literally destroying energy on purpose to heat our homes with high-resistance coils rather than mining Bitcoin for-profit. Truly, we are still at the very beginning of this movement.

Computers are much more expensive than resistance coils and they take up a lot more space. There are purpose built cryptocurrency mining computers that double as elegant looking radiators. Take a look:

https://techcrunch.com/2018/03/08/qarnot-unveils-a-cryptocurrency-heater-for-your-home/