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But they don't even need to do that - they just approach an existing adtech company with a FISA warrant and get their data. If they started their own adtech company, eventually they would be out-ed and exposed. But with a FISA warrant, it's mostly business-as-usual for everyone.

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> But they don't even need to do that - they just approach an existing adtech company with a FISA warrant and get their data.

Depending on who they approach, they won't even need a FISA warrant because in the US information voluntarily given to third parties has "no reasonable expectation of privacy" [0]

[0] https://en.wikipedia.org/wiki/Third-party_doctrine

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