[ng7j5d9]

How would manufacturers know when cars change hands?

Sure, in the example in the article, it was a lease that was turned in to a Ford dealer. But I've sold cars by handing my keys and a title to an individual who handed me money. The manufacturer of the car was not involved in the transaction.

[reaperducer]

How would manufacturers know when cars change hands?

The same way that every single marketing company, bank, finance and insurance company does. It's public information.

[ng7j5d9]

That might be a good 90% solution - car registrations are public records, which tons of companies harvest, which is why you get those annoying extended warranty junk mailers, etc.

Not all cars get registered though - some are chopped for parts (in which case that infotainment system might live on in another car), some are shipped internationally to be re-sold elsewhere, etc.

And there could be a lot of lag - some cars languish on dealer lots, get auctioned, languish on another lot, get auctioned again, etc. Or a dealer might like your car and slap dealer tags on it and keep it essentially as his personal vehicle for a while without registering it.

Lots of little opportunities for data to leak or remote functionality to be abused. There ought to be a complete, no-joke, absolutely reset everything in the car (and expire any remote access tokens) option in the car itself, that either a buyer or seller can easily invoke.