Small-scale ETH mining on gaming GPUs does take place. But nothing like dystopian warehouses stacked with racks of hardware until the ceiling

Not Crypto just Fifa, more profitable...

https://kotaku.com/ps4-crypto-warehouse-was-actually-farming...

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.