It's been down since at least last Thursday. The way I hear it it's been much longer.
Don't just throw around account access, no matter how pervasive, in the name of impatience. Ever.
In the past I've tried to use Google to sign in to some games and been given a screen that I noped out of because of what it was asking for. That didn't happen here. I assumed they only got my email address (if that), not full email/contact/calendar history.
I checked my Google permissions. iOS has a fair amount, Mac OS X has a fair amount, Pokémon GO has more than both put together. Without asking. That's crazy.