I could very easily see if you go to the same mechanic and they input your mileage between visits and a system having a reasonable chance of getting scheduled maintenance correct based upon time or average mileage.
I've never heard of a company pulling data from a car OTA to do this type of work. (some car insurance companies are a different story though)
No idea if that's the case with Toyota, but it's definitely possible with some high-end cars (most definitely including Teslas which routinely report to the mothership) (incidentally it's fun seeing people drool over teslas then freak out at Firefox or MS telemetry)
Based on that, I'd say anyone who is injured because of this in any way has a great claim against the company for lying about the equipment they provided.
Yet the media will probably spin this as "people just don't care," as they usually do with privacy issues. It's very much an awareness and education issue.
No, it doesn't, at least not necessarily.
I also bought a Toyota last year. They called on a regular timed schedule that had nothing to do with my actual usage pattern. We got a call to come in for our 5,000 mile service when we'd just completed the 10,000 mile service.
It may be a feature of the higher-end models, but it's definitely not something the 2015/2016 Corollas seem to do.
I bet if you were willing to waive the warranty they'd stop calling you. But, being as how the warranty on cars is now 5+ years, and that the maintenance variance among owners is high, I don't see this as a bad thing.
Granted, it's not happening to me (yet), so I might complain too.