Why is this considered an ending?

(I recycled this from a comment I made, including the same image from the post).

You can answer comically or seriously, but why is this considered an ending in the game? Colin is only playing in multiplayer mode now.

(I recycled this from a comment I made, including the same image from the post).

You can answer comically or seriously, but why is this considered an ending in the game? Colin is only playing in multiplayer mode now.