For employees at Uber, quitting the company often means walking away from restricted stock units or stock options worth hundreds of thousands, if not millions, of dollars in Silicon Valley’s most highly valued private company. With Uber currently worth about $70bn [...]
FT makes it sound like this is hard cash that employees are walking away from. The options are paper money, and $70bn is not was Uber is "worth", but merely a valuation projected from the most recent investment round.