You leave game, you get punished. The devs don't care why you left, they just know that you didn't finish the game and the reason you didn't finish it is because you rage quit.
Would I rage quit in that situation? Probably, being spawn killed is annoying as hell. But now there is punishment for it. You can leave and take the loss and punishment, or stay, try and fight back and loss, but get more exp and bonus exp at the end.