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I can not agree more with your second paragraph.

Yes, Bing toolbar just rely on people clicking links. But without Google doing all the hardwork here, users will never know about such link, that's why they went to Google. And there will not be any of such link to feed to Bing's system.

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You could also argue that the user is doing the hardwork by going to Google (or any other site, since this is not specific to Google) and deciding which links are relevant by clicking on them. The user has opted share this work they have done with Microsoft (by installing the toolbar and agreeing to the terms) to help them get better results on Bing.

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