These listings of "net worth", etc. all include the nominal market value of their remaining ownership of whatever company they founded.
Jeff Bezos has a "net worth" of $160B. That's not because he sold Amazon for $160B. It's because Amazon is worth $2T and he still owns 8% of it.
At what point would you suggest the government should have taken away that 8% ownership so he would not become a billionaire?