subject line of OP is misleading. "Sneaks" implies the user has no way of seeing it coming. In this case, it is mentioned quite clearly on the download page as well as how to remove it.
http://www.microsoft.com/downloads/d...1-6383ba034eab.
The only way that is sneaky is if the person installing it is blind and not using any kind of text to speech. Or if the user is too mentally challenged to make sure they find out what they are installing when they do an update. I would expect a wowmatrix user to consider it as "sneaking" but not someone here on Wowinterface.