ethical billionaire
A close example is Warren Buffett. He's about as ethical as they come IMO. He still lives in the same house he bought over 60 years ago, and he has given away a ton of money:
As of June 2025, Buffett had donated over $60 billion to charitable causes.
Hearing him talk about it, it's apparently really hard to give away that amount of money. He wants to give away something like 99% of his money, but he seems to really like his job and that takes priority for him. He has claimed his children are tasked w/ giving the rest away within 10 years of his passing, outside of the little he has marked for inheritance.