Uber moved from stock options to RSUs in December 2014. People who got RSUs are OK. Those that got options in late 2014 are probably the worst off but unsure what the strike price was for those.
Most people who joined in 2015 were getting RSUs and not options. Also, the strike price on options is dependent on the 409A valuation and not the valuation at which they raised money.
They arent getting zero, they get the RSUs they were given and which vested. Sounds less dramatic that way. Still, many probably expected more.