When do we have an expectation of privacy anymore?
When we are not actively broadcasting our location to third parties as an inherent part of the service? Privacy isn't possible when your phone is broadcasting constantly where it is. Any more than privacy on the internet is possible, since everything you do, by the nature of the internet, passes through multiple parties' anonymous hands.
By that same screwed up logic, you have no expectation of privacy when talking on the phone because you are transmitting your voice to a third party
to relay it to it's final destination. Yes, my cell phone carrier has to know where I am to route my calls but that doesn't mean that they are free to put
a map on their website showing my exact location at all times to anyone who wants it.