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Mozilla review of 25 car brands finds they're "a privacy nightmare"
(foundation.mozilla.org)
This is a most excellent place for technology news and articles.
Any information they get is going to be examined for keywords at the very minimum. If, for example, you text your wife about test results from the doctor's office, they can add that to the profile they're making of you. If you get a text from a cardiologists office saying your results are in, they can infer you have heart troubles. Things like that.