The thing is, whether it be bill gates, Jeff Bezos, warren buffet, etc, let’s use round numbers, say each is worth $100 billion. If they give away $5 billion or 5% per year of their net worth, yet they are earning a minimum 5% on their portfolio, they will always have the same amount if not more of money at the end of the year.
They can never give it all away.
Imagine trying to spend $5,000,000,000 a year on yourself? That’s ~$96,000,000 a week that you’d have to spend! It’s mind boggling.