Its a bit of a stretch but they could be scaling back high load services (ie. High Res map tiles) to non Bing products to ensure their 3D Maps release runs buttering smooth. http://www.bing.com/blogs/site_blogs/b/search/archive/2013/12/05/maps3d.aspx but in this day and age that'd be an extraordinary step to take (and an indicator of not being confident in your own ability to scale).
Anyway. It just a guess. If enough people notice then we should ultimately arrive at a reason why. Thanks again for the heads up Andy. Cheers, Jason
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