Realistically how would you ever know, if there's simply an agreement that you let the car collect "some telemetry" and simultaneously allow the manufacturer to share that data with "their partners?" If you say it's because you read agreements like that before buying a car, I just don't believe you. Look at all the things Toyota and Subaru have done in this arena over the last few years.

Unless there is legislation to prevent it we will reach a point where at the very least private insurance companies will have access to this data, provided they are willing to buy it. In an even worse scenario we'll have courts and law enforcement with access to this as well.