It isn't new, but it's in the buzz. Let's face it, stateless MVC for the web is a local maximum. We can do much better, but not if we stick with this MVC crap.
MS hires a third party to police these SERPs. The third party does't send notices to Bing because they'd be threatening their own client! It's that simple.
Anything more would require additional effort and initiative and coordination between the contracting team, the contractor, and the Bing team. Probably someone just hired the third party, turned them loose and didn't put any more thought into it.