Most importantly, this always requires the user's concent. On Android you still need the same location permissions as for normal GPS location positioning. Hence, as a user you're always free to reject location permissions same as before.
I have to admit, this tech can also be used for evil purposes. For now, not all phones support collecting raw measurements - either hardware or software support is lacking, but in the future if some entity could force you to have your location verified, then having you cannot lie about it anymore.
