[gruez]

>Big data companies will if you're near your toothbrush then you're at home. And they can figure out where "home" is by other tracking methods.

You don't need bluetooth to do that. By keeping track of your public/private ip (which requires no special permissions), and correlating it to time of day, it's fairly easy to infer whether you're home or not. If there's a network you're regularly connected to during the evening and weekends, it's highly probable that you're "home".