Yes, it does appear that initially Pokémon Go could cause privacy problems, since it asks iOS for full access to a user’s Google account. (And Google has lots of information about you.) But independent tests seem to show that they only info that gets collected is your user ID and email address. The developer, Niantic, is changing the app so that it only asks for the basic information. So, it doesn’t appear that you have to worry about privacy issues – you only have to worry about stepping in front of a car or falling down an open manhole while walking down the street staring at your phone. Note that the Android version did not ask for all the privileges, so it doesn’t need fixed. See more details about this at Ars Technica.