Firstly, because it provides the stage for a robust competitive multiplayer element the base game can only do in co-op. (gamingnexus.com)
We announced earlier that we are exploring multiplayer elements for our future games, but that doesn't mean those games wouldn't have a strong narrative. (wccftech.com)
These will be local multiplayer but there will also be an online multiplayer element. (the-arcade.ie)