That's because there's no simple way to scan billions of images to determine their provenance.
Even glancing at your screenshot what's to say a lot of those aren't older artistic digital images?
This can be a fun learning example for you and the kid both. Download some massive packs of images online. Millions. Lump all of them into one single folder. Now sort them for common features, which were made with cameras, which were made digitally by a person, which are AI, etc.
