Conventional consumer data collection relies on users coming to the collection mechanism i.e. spending time on a website or interactions on social media.
Apple is poised to withstand many privacy protection measures because their collection mechanism is in millions of peoples' hands and pockets. iPhone users are providing high-resolution data to their platform. The accuracy of your personality profile and related data are nicely packaged and easy to convert into highly targeted advertising.
All running on closed source Apple software, with no physical on/off switch for those data collection pathways... or even the phone itself, which never fully shuts down. So maybe Tim Cook really is Big Brother.