Maps/mail/drive/docs/flights/translate: provided for free using their dominance in ad tech to bankroll it and feeding the data back in to the ad platform. No one else can compete, and using dominance in one market to ensure dominance in others has historically been a clear trigger for antitrust.
Android: they lost a court case over this one that has lots of details if you care to look.
The rest are a weird mix of paid services that should be fine to stand up on their own or not even products at all (OAuth).
