Why do people never mention Larry Ellison when talking about the richest people in the world, even though he is the third-richest person in the world, with a net worth of nearly $300 billion, almost $100 billion higher than Zuckerberg's?

Why do people never mention Larry Ellison when talking about the richest people in the world, even though he is the third-richest person in the world, with a net worth of nearly $300 billion, almost $100 billion higher than Zuckerberg's?