[ap22213]

People wouldn't mind as much if they had the same kinds and amounts of data on the their observers as their observers have on them.

I kind of work in this field, and it's easy to know a lot more about a stranger than they know about themselves. Given the law of large numbers, I can make lots of accurate predictions of a person's future behavior, and I'm not amazingly smart. I'm also careful to not spy on people because that's just creepy. But, I'm certain that there are people out there using similar types of data who are 1) way smarter than me, 2) creepy, and 3) devious.

(BTW, the data that I use has all PII removed, but it's trivial to identify individuals, if one is motivated)

[xorfish]

https://media.ccc.de/v/33c3-8034-build_your_own_nsa#video&t=...

It is really easy to identify a majority of users of such a dataset.