That's not what bing is doing in this case. What bing is doing is taking information from Google, as collected by users, and presenting that information to their own users.
Ya, and? They are also taking information from a whole bunch of other sites collected by their users and incorporating that information into ranking search results. I don't really see how this is inherently wrong.
I'm not saying that it's inherently wrong, I was attempting to explain to you how your example (Google using A/B testing to determine which results are the most relevant) had no relation to what bing is doing.
