I'm not sure how this ended up being about wealth taxes. If you get RSU pre IPO, you have to pay regular tax on the value at IPO time. So, if you get a billion

I'm not sure how this ended up being about wealth taxes. If you get RSU pre IPO, you have to pay regular tax on the value at IPO time. So, if you get a billion dollar in RSU, then you pay a couple hundred million in tax at time of IPO. Hence, unless you are already rich, you need to sell stock just to cover the taxes. I'm not sure what kind of stock Uber issues and what kind a founder would have gotten (e.g options, RSU,...)