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Meta’s new AI image generator was trained on 1.1 billion Instagram and Facebook photos
(arstechnica.com)
This is a most excellent place for technology news and articles.
The models are deliberately engineered to create "good" images, just like cameras get autofocus, anti-shake and stuff. There are many tools that will auto-prettify people, not so many for the reverse.
There are enough imperfect images around for the model to know what that looks like.