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Go to this link - How to delete your Pok?mon Go account | iMore
I suggest deleting it at least until they fix their required permissions. They take way too much information from your google account. I'm not even touching the fact that they are tracking you consistently. I just deleted my account. You have to go through all the steps, check all the boxes, and respond "DELETE" to the e-mail that they send you.
That's a good point. I just didn't like the battery drain as well as some company having the ability to track me. I've found out that they also have full access to your google account even if you delete the program. It's a good idea to look at your app access on your google account and revoke the permissions.