There was a MS employee on twitter the other day (sorry, I forgot who) saying it was because there were legal issues with naming something with a title that has someone else's trademark as the first word.
That completely makes sense in my mind just because my favorite reddit app is called slide for reddit. I think reddit forced everyone to use x for Reddit in their name as opposed to Reddit X.
Reddit did exactly that, like five or six years ago. A bunch of apps had to change their names, which is how you end up with apps like "rif is fun for Reddit," where the first part stands for "Reddit is Fun."
