On a T-Mobile device with multiple users, Metro apps that can't be removed have appeared. I'm at a loss as to what can be done. Ideally, one would think that one would be able to choose.
If it's a carrier-branded phone, it's up to the carrier to load apps and either allow uninstall or disabling such apps. However, some of those additions are not always 'full downloads' but shortcuts that would prompt you to download the app after opening.