I really hate this notion of "you have no right to complain." The only thing that your contract takes away from you is your right to pursue legal action on things that fall outside of its scope. If you have a contract and the company begins doing things that you believe are outside of the spirit of the agreement, you should absolutely complain. This driver is even maintaining the terms of his contract by continuing to drive.
The idea that you shouldn't be allowed to express your grievances because you work at the pleasure of your employer/company is toxic and regressive.
Again, not an employee; in fact, the standing here is almost the opposite; it's Kalanick who has most of the obligation in this relationship. (I think we agree about the rest of this).
I keep bringing this up because it's crucial to Uber's business model and something that has been repeatedly disputed. Uber badly wants its drivers not to be employees but instead partners. Kalanick can't get huffy when his business partners have grievances for him.
The idea that you shouldn't be allowed to express your grievances because you work at the pleasure of your employer/company is toxic and regressive.