This is just anecdotal, but some people run their GPU for mining during Winter since its 'free heat'. This basically renders the GPU into a space heater, which

This is just anecdotal, but some people run their GPU for mining during Winter since its 'free heat'. This basically renders the GPU into a space heater, which is 3x-4x less efficient than a heat pump. Additionally, some individuals steal electricity (eg. from their workplace, or if they have electricity included in their rental contract). Cryptocurrencies have thus conveniently enabled a form of electricity theft and fraud previously impossible for the individual.