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Just thinking about only my push notifications yesterday and they revealed that I am clearly a developer or technologist (push notifications from Git/AWS/etc), who got a haircut (time and location were revealed in the message, but I'm sure government-level agencies could have tracked which SportClips location the appointment belonged to), that I am interested in generative AI, and working out.
Another day might have yielded far more interesting facts, but those bits added to a record of my interests and habits can become quite powerful over time.