It seems they’re concerned that users will be asked to provide information that would allow Google to track who they are and where they.
As the Travelocity gnome would say…”Bullhonkery”.
Hello? Google is offering free wi-fi, that’s F.R.E.E, free, as in no cost. Let them collect the information. If users don’t want to give out their info, guess what, let them pay for wi-fi access!