The copyright page, which a lot of folks point to, actually says:
Except as noted, the contents of this site are licensed under the Creative Commons Attribution 3.0 License, and code is licensed under a BSD license.
… which means Google can exempt whatever it wants from the CC & BSD licenses. A good legal argument could be made about the BSD license for the code as the commas make things more open to interpretation. The term “code” could include HTML and other markup. But IANAL
Back to my main point, Google’s reputation is not good based on their behavior. I would not want to stake my company or my coding on them.
(Picture via Roman Synkevych (@synkevych) on Unsplash)