Because since the revelations about Google providing the NSA direct access to servers, they are extremely unpopular. Combine that with their reluctance to pax any form of tax, and they have the same public image as an arms dealer.
The NSA appears to have tapped 3rd party fiber links, and not Google directly. Google is now encrypting data across those links, moving all client access to use https, and advocating for http/2.0 (based on SPDY) to allow only encrypted connections.