[DufusM]

Matt Cutts' point assumes a very naive point of view, I believe. From his/Google's point of view, it is fairly disingenuous for Microsoft to use Suggested Sites data for Bing ranking - however, there's quite a few examples (from gmail's current "ads based on not just the current email" to how DoubleClick logs Google AdSense pages a user visits to better target ads to them), where the actual benefit to a company does not line up well with the user's understanding at that point. Clarifying all these points in red bold text would probably change our Internet browsing behavior a lot.