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Google's motivations are long-range, but simple - more ad dollars. Faster DNS means more people using the web (rather than give up in disgust - and if don't believe that happens, let me introduce you to comcasts's DNS servers...); more people using the web means more page view which means more ad revenue.

So no, definitely not altruistic.

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I just thought it was to track user actions via DNS - they can see which sites you visit without needing tracking bugs on those sites. Better profiling means better ad serving for Google ... profit.

https://developers.google.com/speed/public-dns/privacy?hl=en

"We built Google Public DNS to make the web faster and to retain as little information about usage as we could, while still being able to detect and fix problems. Google Public DNS does not permanently store personally identifiable information."

They specifically promise not to do anything like that.

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