I very much doubt it. I think the more straightforward explanation is far more likely - that someone has fed an Amazon listings bot with a big library of cheap

I very much doubt it. I think the more straightforward explanation is far more likely - that someone has fed an Amazon listings bot with a big library of cheap or pirated stock photos. If you look on any stock photo site, you'll see huge numbers of unusual images with very specific titles. For stock photography, it makes perfect sense; there's a very long tail of articles that need cheap illustration. Healthcare is a very lucrative niche, hence the preponderance of medical images. Obviously this dataset is massively unsuited to this particular purpose, but if the cost of a listing is effectively zero, then there's no real downside to being completely indiscriminate. Given that the seller has listed nearly 32,000 items, I don't think that there's any amount of human decision-making involved.