That's a real dealbreaker. I've never seen an in-house media/nav system better than Apple's, and I don't expect GM's to be any different.
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Do replicate this, you’d either need to sync all of that to your car, or migrate to Google’s ecosystem… maybe both.
With the track record of automakers and data privacy, I don’t know who would knowingly do that. It also seems like a giant pain when nearly every other car doesn’t ask the buyer to make this kind of choice.
Additionally, even if Toyota were to get breached, they would not get my data