>According to advertisers, both Apple and Amazon have levels of detail about customers that would be extremely attractive to ad agencies, but refuse to hand it over, citing privacy concerns.
In Apple's case, the sheer volume of information it has about its users frustrates advertisers because they can't access it. One unnamed source said that in terms of attractiveness to potential advertisers, Apple is "the best-looking girl at the party, forced to wear a bag over her head."
https://www.infopackets.com/news/8939/advertisers-amazon-app...