Data anonymization is largely BS, it has been shown in the past that with enough data it is fairly easy to specifically figure out who the person is. This is how people receive highly specific and targeted ads. I know this because I have worked in advertising and it's amazing & creepy that how specific I can get in my targeting. So yes, they in reality make money by selling user data and showing them ads using that. My bigger problem here is that when I buy a mobile device by paying money, why should I have my privacy not respected.