PSA: AFKing or DCing in ANY game mode is reportable and bannable.
Let's put this into perspective, turning a 5v5 into a 4v5, especially in a game like URF is no fun for the 4 side. I had a game recently where a Corki just suddenly left and never came back without a word, so I said "report Corki afk."
The enemy response pissed me off; "Lol it's just URF"
Yes I know, thanks for clarifying, stupid. What I'm saying is it's no fun at all regardless of what game mode when you're getting stomped in a 5v4 bloodbath.