Dude,
Heat Pumps or even those little heaters are more efficient at heating you home than the nonsense above.
Don't waste your time with crypto mining, it is a waste of your time and energy.
Only the rich actually make money off mining, the rest just waste their time.
You're judging without reading. That guy in the article has a heat pump!
He's using mining cards to preheat air that goes into the heat pump and make it draw less power.