Wall Street Journal: Google planted code on millions of iPhones that allows companies to track user behavior. Google has denied that the embedded code, or cookies, tracks users, and said it is only activated when users opt-in to one of Google’s services. Google also admitted that the code inadvertently allowed additional Google Web advertising cookies to be installed on users’ phones, against users’ wishes. Google: “We used known Safari functionality to provide features that signed-in Google users had enabled. It’s important to stress that these advertising cookies do not collect personal information””]
Source: https://www.csoonline.com/article/2130927/wsj–google-disregarded-iphone-privacy-settings.html