Just do a quick search for "DMPs" or "data management platforms." Multi-billion dollar industry that's focused on collecting data from many different sources,

Just do a quick search for "DMPs" or "data management platforms." Multi-billion dollar industry that's focused on collecting data from many different sources, consolidating, and aligning towards real individuals with a combination of deterministic data and probabilistic assumptions. Then, they can sell access to that database to various companies, mostly in the ad-tech space. Source: did consulting work for an ad platform in the RTB space on the DSP side, competitor to Google. EDIT (more context / sidebar thought): this is also why Apple deserves some credit here for their moves, as they are one of the few companies with enough of a war chest to fight against these multi-BILLION dollar interests. It's the type of advantage I worry about losing if Apple has to open up different app stores on the iPhone: if a developer doesn't want to submit documentation and/or get bad publicity for lack of a privacy label, they'll just go to a different, less strict app store.