He probably is the guy to run a business like Uber. In an industry rife with corruption that often resorts to bully tactics, you need someone who will not bend on vision and principles because of personal threats.
He could have sat back and avoided a public smear capaign and retire to nice life as a billionaire. Instead he choose to fight for what he believes is right.
One has to believe that given the options for him, the choice to resist is not about money for him. It maybe about ego and his desire to change the course of history, but the latter is probably good for Uber if he gets to stay on.