Good question. He definitely seems like the type that would have a dungeon with captives.

He got his wealth because his parents owned a slave-powered diamond mine.

Also, as he hides his money and doesn't pay taxes the US government is overburdened and one of their tools is relying on prisons for free labor.

Soooo actually quite a lot.

Let everyone incarcerated go and see how that works out for you. Not saying everyone deserves to be in there, but go on. Give it a try.

You also forget that billionaires are wealth, and so is any dictator. They both seek to protect that wealth, so it doesn’t matter in the end. A billionaire buys his politicians and you get the same result. You start threatening their money and power and they’ll come after you, whether you want equal rights or sometimes just clean water.