I've had a few friends volunteer for this already; in my limited experience they are typically used only for a period of time (weeks not years) and are typically marketed as "use our tracking device and get a safety discount."

It strikes me as creepy, but I might think differently about them if I needed a discount.

Not sure why this comment is dead. Car insurance tracking devices are already a thing, with some scoring the safety of your driving and providing suggestions (recording the G-forces attained and determining that hard control inputs are indicative of dangerous driving).