Uber campaigned widely against the requirement to the point that it's now facing a class-action lawsuit for spamming people with text messages asking them to vote in its favor. After losing the election, both Uber and Lyft pulled out of the city, leaving thousands of drivers without work. Some of those drivers filed lawsuits of their own, accusing the ride-sharing companies of breaking federal law by shutting down their operations in Austin.
Reuters notes that Zimmerman's argument is similar to another complaint filed back in March. It sought to stop the elections, because the ballot language was confusing. The Texas Supreme Court, however, denied the plaintiff's request.
This article by Mariella Moon originally ran on Engadget, the definitive guide to this connected life.