"Surrendering our privacy to the government would be foolish enough. But what is more insidious is the Faustian bargain made w/the marketing industry, which turns every location ping into currency... in the marketplace of surveillance advertising." nytimes.com/2021/02/05/opi…
"The data is supposed to be anonymous, but it isn’t. We found celebrities, Pentagon officials and average Americans..."
"It became clear that this data — collected by smartphone apps and then fed into a dizzyingly complex digital advertising ecosystem — was a liability to national security, to free assembly and to citizens living mundane lives."
"the data collected on Jan. 6 is a demonstration of the looming threat to our liberties posed by a surveillance economy that monetizes the movements of the righteous and the wicked alike." nytimes.com/2021/02/05/opi…
"I'm not safe if I'm being surveilled against my will."
"Our findings show the promise of anonymity is a farce." nytimes.com/2021/02/05/opi…
"the supposedly anonymous ID could be matched with other databases containing the same ID, allowing us to add real names, addresses, phone numbers, email addresses and other information about smartphone owners in seconds." 
Ah, the data join.
This is a really great straightforward illustration of how 2nd party data and data joins work and why any unique-per-user ID is inevitably de-anonymizing.
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