The Android version of the game apparently does not have these issues.
Reeve said that the security situation was not the same for all iOS users.
Pokémon Go was released last week and has been a huge hit. It is the latest in a series of games from Nintendo but is made by a developer named Niantic, which is part owned by Google.
As there was no indication of what services the game would have access to, he did a check and found that it had full access to his Google account.
This means that the game and its maker Niantic can read all email in a user's account, send email, access all Google drive documents, examine the user's search history and Maps navigation history, access any private photos in Google Photos and much more.
According to the Macrumors website, Niantic began life as an internal startup at Google by Keyhole founder John Hanke in 2010. It then became independent in October 2015.
Google then partnered with The Pokémon Company and Nintendo to invest up to US$30 million in Niantic.
It is well-known that Google snoops on its users and this will no doubt fuel privacy and security concerns over this blanket Google account access granted to the game.