Well, not quite. Their (unofficial) motto is "don't be evil", which is not the same as "do good". Besides, it's only so because of the opinion that --in the long run-- being (perceived) as a good company is better than being a short-term greedy one.

You could debate whether removing Adblock constitutes an evil act, but at the end of the day _someone_ has to pay for those shiny new services and gadgets.