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If your criteria for failure is that the company is more interested in making money than you, personally, then there isn't a successful product on the face of the earth.

Of course Google is trying to use Google+ to make ad revenue. You know, exactly like Twitter and Facebook, who you hold up as opposition to Google+.

If Google fails here it will be because they didn't make people want to use their product, plain and simple. Not because the people ultimately paying them aren't the people using their product. If that were the case, half of the web wouldn't exist.