Google's Jonathan Rosenberg wrote a paean to 'open,' in which his company's commitment to 'open' is pitched at great length. The most remarkable paragraph, however, is the one dealing with things that Google keeps closed:
While we are committed to opening the code for our developer tools, not all Google products are open source. Our goal is to keep the Internet open, which promotes choice and competition and keeps users and developers from getting locked in. In many cases, most notably our search and ads products, opening up the code would not contribute to these goals and would actually hurt users.
How odd that of all the products Google would be forced to keep proprietary by its commitment to an open internet, it just happens to be the ones that make it all of its money.