You, I mean you personally, cannot generate a billion dollars. Nobody can. I dare you to try. Try to think of a way to make a billion dollars, without already having several hundred million dollars via generational wealth.

You can't generate a billion dollars, but you can find people to generate a billion dollars for you, and then instead of allowing them to share in that billion dollars, you just underpay them. You convince them (by deceit) that $100,000 is a pretty good salary, while you pocket $999,900,000. You tell the government that paying taxes would "significantly harm your business opportunities," so you pay $0 in taxes.

That's how you make a billion dollars. Cheating. Lying. And hoarding. Think twice before you say "not your money" again.

How are they entitled to it?

I am entitled to have agency over my life, so do the people around the world from which this agency has been robbed much much more severely than mine. The capital billionaires have is not just "some money", its control over me and those billions of disenfranchised people. If you actually go through the linked visualization, you can see how. 800 kids die every day through easily preventable malaria. All of these rich people could easily pay for the necessary treatment and wouldn't even notice the most minute possible impact on their life. That is control. Thats the agency those 800 children a day do not have ovef their own lifes.

I disagree. I think any wealth over a certain amount should be redistributed.