As a Google employee I would expect very few cases of unauthorized user data access. There are lot of security checks around access to user data. I would guess

As a Google employee I would expect very few cases of unauthorized user data access. There are lot of security checks around access to user data. I would guess that almost nobody has raw untracked access to sensitive data. Some engineers may have direct access to storage layer, but wouldn't be able to read the data because it is encrypted. Some others could read the data, but can't do it without all of their operations being logged and potentially audited.