This is sort of what Nvidia did with the cards they sold directly to miners. At the end of the day they're still GPUs (albeit without display outputs) so they could in theory be repurposed for work that actually benefits society.

In practice that would never happen because by the time miners are done with the cards they'd be too out of date for machine learning or other general compute workloads, and useless for budget gamers because of the lack of display outputs. It's really a shame how much power and silicon is being wasted on cryptomining.