Google should just become an access provider. As an ISP they would have authority to go over each and every packet with as fine a comb as they can muster. In the interests of "regulatory compliance" and "providing better service" of course.
It's disturbing to see some commenters making arguments that essentially amount to "but everyone else has always done it or is now doing it".
When you are Google you can pretty much do as you please. That includes taking the high road and ignoring foolish critics. Or taking the low road. And ignoring foolish(?) critics.
I'll tell you.
You know that thing called a "license" that geeks are always arguing about?
Grab one of those, Adobe's or anyone else's, and find the section that is all uppercase that includes the word LIABILITY or the string LIABL.
In that section you will find your answer.