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"secret running track" feels like a joke, but the point it illustrates is clear - the massive uncontrolled dispersion of location data.

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There was also a case of soldiers using flash-card apps to learn about the nuclear bases they were stationed at, revealing various facts.

https://www.bellingcat.com/news/2021/05/28/us-soldiers-expos...

This shows that people generally don't understand client-server architecture and think that the app stores data on their phone and not somewhere in cloud.

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