Greyball was allegedly used in cities like Las Vegas, Boston and Paris, plus in countries like China, Australia and South Korea, to deny service to Uber accounts considered as a threat to the company.
Now, another controversy has surfaced and it involves a tussle with a company that Uber can't afford to irk.
The New York Times reported that in early 2015, Uber CEO Travis Kalanick met with Apple's Tim Cook to discuss specific questionable techniques the Uber app was allegedly employing.
Apple engineers discovered that the app was tracking its users even after it was deleted from iPhones. This practice, called "fingerprinting," violates Apple's privacy guidelines. "Fingerprinting" assigns each iPhone a specific identity via a small piece of code that persists even after the device's data has been wiped.