Images generated by these systems look nice because the models were trained on photos that had already made it through curation filters before being published o

Images generated by these systems look nice because the models were trained on photos that had already made it through curation filters before being published or distributed. Most people toss out their garbage photos and don't share them online. Without that, computer-generated images would be far uglier and weirder. And if the computers had to get their new material from, say, a bunch of webcam feeds, the composition of their output would be terrible.