If the user base chose to use WhatsApp under the guise that personal information was not shared, wouldn't this drive some of the user base away? I know some who use the app because when they are able to use wifi over seas they are still able to text. There is a consistency when traveling. This is a comfort they may not be able to maintain due to the change over from a GSM to CDMA network or from a European carrier to an American prepaid one.