I don't think there is much left from the "don't be evil" motto at Google. It has to make sense: financial, strategical, tactical, operational, etc.
Remember, IBM's role in the Unix case with SCO: they acted like open source was their new found religion (if you followed Groklaw).
And when the time came and they got "an offer they couldn't refuse" from Oracle, they abandoned the religion in a blink of an eye.
And I'm not even talking about Oracle and Novell.
I think this is the case with Google and open source, too.
But unlike Apple that took BSD for OS X (for the "free as in beer" license) and closed up most of its own development,
Google decided to go Linux with their Android and harvest the open source developers "eye balls".
They still reserve the benevolent dictator role for themselves - you have to get a license to have Market access.
But there is nothing that prevents you from taking the code and releasing a device running it.
Or selling apps for Android (just what Amazon plans to do). Or replacing Google search with Bing...
I think Google believes in open source as the ultimate tool reducing the barrier of entry. In any market it can be applied.
It reduces patent dependence. They are even ready to take on Oracle with the Java VM debacle.
I think H.264 vs. VP8 is somewhere along the same lines...
In the end this has nothing to do with charity. It's Google way of making money.
It just so happens that this way is not synonymous to raping others like most of the MS, Oracle, IBM of this world do...
Diogen.