Uber Rich would be The Kochs or Warren Buffett, Bill Gates the Waltons, the Murdocks, the Krocs, the Bloombergs.
The Clintons make most of their money giving speeches I have never paid to hear either of them.
If Chelsea can make an average years pay with an hours effort, they are making pretty good money on speeches.
Book advances are not bad either.
They are also being handed a lot of gifts by sycophants and power seekers.
If their wealth is not Uber yet , then it is just a matter of time.