And yet, the citation I gave shows Stable Diffusion obviously replicating copyrighted images from the LAION training set, despite your musings about thermodynamics. It may not store reproducible representations of all images, I don't know - but it unquestionably does store some.

In any case, it doesn't change the fact that copying images into the computer in the first place, in order to train the model, would need to come under a fair use exemption. For example, research generally does - but not in every case, especially if it causes economic damage to the original authors. In many countries, authors also have moral rights, to attribution, to preservation of the integrity of their work against alteration that damages their reputation, etc., which may come into play.