If anything I'd say it's the opposite. A random person can get away with cons and scams for a long time. Whenever they get caught, they can just set up shop somewhere else. They can change their name (or simply lie to others about their name). Famous people can't do that. If you're famous, you can commit one scam before your reputation is ruined. Even if the story manages to avoid the news, people talk and word spreads. The incentives are such that a purely selfish billionaire sociopath is better off being honest.

Also, being extremely rich makes you a target for ambitious or activist prosecutors. Everything everywhere is securities fraud.[1][2] Whether you're hung out to dry or not is determined by how much your behavior has annoyed people in certain departments of the US government, or how much you've annoyed their friends.

1. https://www.bloomberg.com/opinion/articles/2019-06-26/everyt...

2. https://www.bloomberg.com/opinion/articles/2021-06-22/everyt...