Earlier quoted context omitted.
The difference is that Google has proven that the results of certain queries are being directly fed as Bing results. If Microsoft does the same with Google rankings, I'd see your point, but right now the evidence only points in one direction. However, these are also the only experiments that have been run - outlier data, gaming the algorithms. If you only test one possible outlier scenario and don't control against a…
what control are you suggesting? I read a suggestion elsewhere of using only Firefox for some queries and seeing if they show up, which is silly, of couse. without a possible mechanism of action there's no point of using something as a control; I might as well wait to see if the files on my disabled usb drive show up on bing. they were "gaming the algorithms" because they suspected that the algorithms existed, and it…
Same as what google did, just not on google.com.
Of course, if Bing has other "relevance" indicators (ala BingPageRank) then this might not work because it will rule the nonsense control site irrelevant linkspam, and not put it in (even Google's experiment only got a 9% success rate.) It would be better if someone like Facebook injected the test nonsense strings in their URLs.
Something of this sort would at least show they tried to differentiate between "scrapes all clickstream data" and "uses Google's search results".