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Thats alot of words for saying your smartphone is listening in and possibly watching.
The article does nothing to detail what kind of smartphone sensors are used. I bet the gyroscope isn’t gonna be it when people are cough locked.
But microphones are sound sensors and cameras can also fit the bill so…
You don’t even need sensors, you can tell from the websites/apps people use and especially from their typing behaviour. I can do 50WPM on my phone when sober, but less than half that when I’m not.