Honest concern: how do we know that Apple isn't going to secretly share this data anyone who asks for it politely? I know they've been very good at maintaining privacy-first appearance, but where is too much good stuff a bad combo?
Seriously though, I love iPhones as the next guy, and find them very convenient, but are we trading convenience for carrying an unbound GPS tracker in every pocket, and if so, how do we change course? Is it even possible these days to unsubscribe from Apple/Google without feeling like one's living back in the stone age?