They are more interested in supplanting google with bing than in destroying that business model? And they might have been afraid of accusations of abusing their dominating position in the browser market and not have reevaluated in light of their shrinking market share.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
If continuing the discussion becomes impractical, that means you win at open threads; a celebratory top-level post on the topic is traditional.
Poster's Note: omg, it felt so weird typing "2012" up there.