I can imagine this being initially an accidental discovery like oh every time so and so’s body interacts with the WiFi signal it’s the same pattern… until someone starts exploring this further… and then some engineer or their manager started looking for applications for this. In my experience engineering researchers especially are very good with coming up with use cases for whatever tech they’re working with, with little ethical consideration.

Tbh I always loved the idea of an opinionated car GPS/AI, just for fun, I always thought it would be hilarious if it gave instructions with an attitude or responded to the driver in kind, depending on what you throw at it. Still not buying a Tesla, just saying.