Adblock does not block Google ads by default.
by Google ads do you mean ads on Google? Or AdSense ads placed across the web (AFS? AFC?)? or do you mean AdSense + Doubleclick (DFA, DFP, ...) + AdExchange + AdMob + I could go on for a long while. Bottom line is google, more than anyone else, has a lot of skin in this game.
Despite all the alternatives that can be installed instantly?