There are other companies out there that solve interesting, challenging problems and don't have this toxic culture. There are other companies with talented people. And if enough of your coworkers disagree with Uber's culture, policies, etc., then the talented, moral people that you work with at Uber may even come with you.
The only way Uber will ever pay attention is if it affects their bottom line. Employees leaving, or people turning down offers is, person-for-person, one of the most impactful ways to do this.