The real solution is to nuke the onboard modem if you must have a new or modern car. This can almost always be done with minimal side effects, because cars are expected to work even in areas without cell service.

Single solutions/solutionistic approaches will likely be incompatible with either goal; consumer needs are always changing and collection capabilities expanding. Data scope and retention also need not be counter to consumer wants, and in the very least requires a mechanism that allows consumers to 'dial in' their preferences rather than wholesale accepting/rejecting terms of usage (i.e. a gradient instead of a binary).

I've yet to encounter a service that has implemented this successfully.

Rivian has given a cool solution, apparently because of consumer demand, or idk why they did.

Rivian lets you disable all data collection: (https://news.ycombinator.com/item?id=47967786)

I don't think consumers care about their cars being connected. Personally, I would just rather use my phone for whatever connected features you would want in a car.

I think that that would have been Apple’s positioning for their car project, but that seems to have been axed.

Maybe they’ll bring it back someday, I hope they do, but it’s almost guaranteed that governments will rain down regulation on them for entering too many markets at once—and yes, for building operating systems to which Apple refuses to build a backdoor to the encryption.

Locally we do a lot of stripping back and rebuilding, we (W.Australians) aren't that fond of being tracked on desert jollies: https://www.youtube.com/watch?v=AYfI3Qo9dNc

I propose requiring explicit opt in for each piece of data collected, and explicit opt in for each piece shared to a third party. Failure to opt in for a particular piece should only result in the degradation of features that can be reasonably explained as requiring the data.

Apple Maps gives you good mapping without tracking you, but I'm not sure how much of that is a technical solution like e2ee(your FindMy data is e2ee) or just you placing trust in Apple to not break their privacy policy.