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First, sometimes the lighting is terrible if you look. Like shadows going one way for some objects, another way for others.
But generative AI is generally extrapolating from its training data. It gets lighting right (when it does) because it’s processed a giant number of images, and when you tell it you want a picture of a puppy on the beach at sunset, it’s got a million pictures of puppies, and a million pictures of things on the beach at sunset. It doesn’t know if it’s right or not, but it’s mimicking those things.
There isn’t one type. There are the ones like Bezos and Dell, who got rich by growing one or more businesses, and are still at it. They likely don’t work normal hours, but they likely work more than 40. Some of those, like Gates, get older and move on to other things like foundation work, but not an actual job. Hard to say what kind of hours they work. Then there are the ones like Christy Walton, who inherited their wealth and don’t really ever work.