Albeit to be taken with a grain of salt, this is what I was supposing: you cannot have such a huge organization working "properly" on a day-to-day threat-response basis without some "elastic" access control. Even less if you are a contractor like B-A-H.
This, in a private entity, is less dangerous. You can have a lot of sysadmins with some access to Google's data because the data is properly partitioned and especially because there are no "targets". When each individual is a target, it is too hard to get proper partitioning.
Also, Google's employees have little to no incentives to make those data "public." And I guess direct access to the real emails is pretty hard: Google's money is not there but in the analytics. So internal anonymization may be not only performed but even easy to do. And this is good for Google & its clients.