This is just a smokescreen. If we assume, very conservatively, that Wikipedia content outright satisfies 1% of Google searches (through info boxes, Wikipedia widget etc), thats would be worth 1% of $100bn+ of revenue Google generates from search = $1bn. Even if a fair thing to do would be to split that revenue, Wikipedia should still get $500mn in that arrangement. So a $2mn donation is just a smokescreen. Google is extracting extraordinary value from Wikipedia, and just because it is 'free' doesn't mean it shouldn't fairly give back.