Fashion models aren't real because the images of them are photoshopped. If you looked at the humans that inspired the images you wouldn't see the same thing.

Exotic cars are... expensive? A lot of the appeal of owning one is the perception of (and the very real) cost, but they are still what they seem to be.

Really hot and beautiful models exist. They are just rare. They are the 1%. But out of 500M DAU, that means they are 5 millions, and they are the most popular because of their beauty. The unrealistic expectation comes from the fact that people get used to seeing the top 1% because of social media.