You don't get that rich if you don't have something deeply broken inside you. You cash out and retire, or decide to move towards sustainability long before you're in the multiple billions of dollars.

Even musk who is seemingly attempting an R strategy for reproduction can leave every child he has over a billion dollars. Enough each child can without working establish themselves a moneyed family. And yet he felt compelled for a trillion. Enough to leave a thousand descendants a billion dollars (before taxes).