It's strange they haven't tried Bing Maps (differnt than Azure maps), it has a much rich web control and support for Javascript which per the article was one of the selection criteria.
I've tried using Bing Maps for clients and they always complain and want Google. Maybe with the pricing increases that will begin to change. Google Maps lacks any real competition. Sure there's Here, and Apple Maps, and Bing...but none of them are -serious- competitors.
