I'm genuinely curious how that would even work on the technical level. As an app developer, I'm not making the connection here as to how iOS would even allow that.
Edit: Read up a bit more on it. Turns out it was the practice of fingerprinting and tracking after re-installs, not after an uninstall. TechCrunch provided a better technical description: https://techcrunch.com/2017/04/23/uber-responds-to-report-th...