Check out the Forbes list. Most are either self-made or the immediate family of the self-made.
And that doesn't change the destructive nature of wealth taxes. Wealth taxes are about eating the rich, not about revenue. When you finish eating the rich the society dies.
More and more have their wealth through inheritance.
Very soon most will have their wealth through inheritance.
Society does not rely on the rich. They are mainly parasites that take much more than they give.
Get rid of them and we will all do fine.
We need an economy. We do not need the filthy rich. They are a strain on the economy, an inefficiency.
We would all be better off if wealth was more spread around instead of concentrated into fewer and fewer hands.