Videogames run GPUs at full capacity too, we should ban them too. No one NEEDS to pretend to be a cowboy for 100+ hours each across 36 million GPUs.
Actually maybe there should be a ban on computing power above mobile CPUs available to non-government bodies, if this really is so devastating to the environment we need to limit the amount of damage people can cause as individuals, why does a normal person need a GPU anyway when smart phone graphics should be enough.