You can't take the human energy in account, because there's no reason to believe they won't live for the same amount of time and use the same amount of energy regardless.

You are not accounting for the model training (which can't be ignored, first because you can't ignore fixed costs, and second, because we keep training newer models, so amortizing doesn't quite work), rebound effect, the subsidized bot crawling, etc.

I won't comment further on this, this discussion has been rehashed to death anyway and in better ways that I can.

IMHO the better way is to not do meaningless cover images, and this is also true of stock, non-AI generated images (I'm not against art, so if it's your strength, by all means, please do meaningful or nice cover images).