The only opting out I would trust would be to take a screwdriver to the cellular modem and disable it. Of course this would probably bubble up various exceptions so best way to do it may be to isolate the antenna, though that may not be 100% reliable.
You can also opt out of Ford too. They default enable sharing with third party for features, default disable for sharing with data brokers like LexisNexis. It requires you to put in your driver pin to enable that
Uh… Can you also opt out of first party data sharing? Or is Subaru still going to be spying you while pinky swearing to at least not share it with anybody else?
https://www.subaru.com/support/consumer-privacy.html
If you don't live in one of the states mentioned in the first paragraph, expect this to take a very long time. For me it took 6 months.