You may not realise it, but Pokémon Go on iOS grants The Pokémon Company and developer Niantic full access to your Google Account. That includes, but is not limited to: viewing and sending email, viewing and deleting Google Drive documents, seeing what you've been watching on YouTube and accessing your contacts.
Sign into the app with your Google account and you are giving Pokémon Go the keys to a treasure trove of personal data, although both Niantic and The Pokémon Company have said the level of access granted to the app is a mistake.
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