I am willing to bet that there are teams of spies who have infiltrated Google, Facebook, Amazon, etc. Spies from US, Russia, China, Britain, Israel, Germany, etc, must have dozens of spies working as engineers are getting access to all that data as we speak.
To think that they aren't would be rather naive, in my opinion. If I were head of the spy agencies in any one of those countries, it would definitely be the first thing I would do.