Aside from the fact that Elon was born into a wealthy family (which is vaguely like having tall genes, I guess?), he can discard his massive wealth at any moment with considerable ease compared to the task of somehow reducing your height from 6'3" to 5'7". He actively chose to accumulate wealth and hold onto it, there are plenty of successful businessmen who aren't billionaires or aspiring billionaires.

Are you really going to pick height as a comparison point for being a billionaire? Did tall people take their height from short people? Is height taxed?