This usually happens to screen team abusers in UU. When their strategy failed within the first 5 turns such as fail to set up screen, one of their sweeper got cheesed, that person will forfeit in 5 turns in order to prevent their opponent to get any point since they can no longer win.
I think this is a toxic mindset and punishment for doing so should be there. For example, reduce points for doing so. I'm tired of people forfeiting so early just because the game went south for them.