If, like me, you signed into Pokémon Go with a Google account (which is highly likely since the only other way to do it is by creating a Pokémon Trainer Club account and that system has been down for days due to the popularity of the game), the game has full access to your Google account.
In other words, it can read your emails, send emails as you, see your calendar… everything. Full access. That’s what that means. (UPDATE 7/14: Some later claimed that was not actually the case, it was less access than feared. Regardless, it was too much access.)
So, that was fun while it lasted.
(Via David Chartier.)