Just for clarity, there was a "could" in there, in the context of what I stated.

Google and other authorities having such access to so much data about individuals, means they can know of relationships, that the interacting individual parties involved don't know about each other. So, if a wife were cheating on her husband, that can be known. A line can be crossed, where information is leaked to the husband, in various ways. This of course is just a "theoretical" example, of many other kinds of possibilities.

Access to private and personal information is its own kind of power, that can be easily abused under many gray areas, and under all kinds of pretexts and weak justifications.