Um, FYI, none of Google’s products are Open Source ...
What?
35 Google open-source projects that you probably don't know
That'll get you started with a quick list.
All of Google's APIs are fully open and documented.
Google lists over 500 projects and 15 million lines of code released as open source.
You can dig in deeper here.
You might want to read the GNU General License that Linux is written and distributed under. If Google is using Linux, they can't make the code private. It has to stay open source.
That license means that:
...any free program is threatened constantly by software patents. We wish to avoid the danger that redistributors of a free program will individually obtain patent licenses, in effect making the program proprietary. To prevent this, we have made it clear that any patent must be licensed for everyone's free use or not licensed at all.In light of this, you may want to rephrase your comment.