Which means that this is likely to be trash, too;
Bing is a niche player because it's not a great search engine. Pretty much all of its users use it because Microsoft makes it the default, using methods that would never fly if they didn't also own the operating system underneath.
Once the hype wears off, so will most of this supposed growth, and it'll be back to only being used because it's difficult for the average Windows user to avoid it.