> one more substantially less intrusive

wow! this needs proof and evidence. you can't just pull this out of nowhere?

afaik it's becoming harder & harder to get data out of your phone without you unlocking them. now, if you choose to share your private information on said phone, that's another discussion.

i want to think that movement tracking and giving away private information about you -- and perhaps not-knowingly about people around you -- are different things!