Not to out myself, but when the game is clearly over I simply try to lose by intentionally whiffing skillshots, going into unwarded areas when I know the enemy is there ans o forth. I'm actually inting in a way that will lose us the game, but is impossible to discern from simply playing poorly. I know other players do this in greater(Running it down) or lesser degrees (splitting with their brains turned off.)
Yes, I do think its possible for the enemy team to throw, but realize that trying to hold out for that slim chance likely means one or two of your allies likely already gave up and are just soft inting.
we should be able to ff at 3/5 tbh.