So two sides to this issue. I ran into a game like this, and I don't know if it's punishable or not. I doubt it comes up very often.
1) On my team, we had 3 trolls working together to make us lose, while refusing to surrender. They would feed, they would afk, they would stand around in jungle doing nothing--moving occasionally to avoid getting hit by the leave buster. And of course masking their activities in chat. We couldn't surrender the match because they just kept voting no.
2) The enemy team realized this was happening and were very fed. They could win at any time just by pushing. Yet even after scoring aces, they would retreat and farm more--prolonging the game even further while we couldn't surrender. The game ended up lasted 45 minutes when it should have lasted 20.
We couldn't surrender, and we couldn't even stop playing or else we'd get ourselves in trouble for being leavers. So we had to sit there trying to win a 2 v 5 while the enemy team gloated in all-chat and farmed.
I reported them for Negative Attitude... but I doubt that they'll actually get in any trouble for it. So just asking what do you guys think?
inb4 more trolls... ugh.