Google is suing them over potential stolen IP (involves a former Google employee leaving to start Otto, which Uber promptly acquired). This has still yet to be settled but you can read about details here: (https://danielcompton.net/2017/03/14/uber-bombshell).
Then there were several sexual harassment claims that were handled poorly. They can be read here: (https://www.google.com/webhp?sourceid=chrome-instant&ion=1&e..., https://medium.com/@amyvertino/my-name-is-not-amy-i-am-an-ub...).
Their SVP left because of similar claims against him at Google (http://www.recode.net/2017/2/27/14745360/amit-singhal-google...).
Their VP of product also left under similar circumstances (http://www.recode.net/2017/3/3/14805384/uber-ed-baker-resign...).
Google is suing them over potential stolen IP (involves a former Google employee leaving to start Otto, which Uber promptly acquired). This has still yet to be settled but you can read about details here: (https://danielcompton.net/2017/03/14/uber-bombshell).