It has already existed for a decade or so. I’m surprised it hasn’t made headlines before. I saw a working demo of it at the Microsoft Visitor Center about 8 years ago. In addition to estimating your mood, it also assigns you a persistent ID, estimates your height, weight, eye color, hair color, ethnicity, and age. It is scarily accurate at all of those things. That ID can be shared across all linked systems at any number of locations. I completely agree with you that there are a lot of concerning, if not downright terrifying implications of this system. It’s a privacy nightmare.