I said core business. Don't know why is it so difficult to read the whole comment, it wasn't long. If Google wanted to, they could migrate to FreeBSD quite quickly and you would not notice too much.

Google's core products are: Plus, Hangouts, Chrome, Search, Docs, Mail, and all these products on Android. They're the same to Google as Windows is to Microsoft. Yes, Android is open source, the rest aren't. And what consumers call Android is not free/libre either. I have no problem with that, and I'm not criticizing Google, just saying, that companies very rarely open source their core business stuff.