They are still playing and not banned.
Yesterday there was a thread (which was deleted afterwards) created from this user pStJames.
He had a game where his team didn't play at all from the start of the game. He posted even a video with it. I said to myself "pfff you cant escape justice from this , there is evidence !!!" .
Well the thread was removed, the players still play. You can see that they are 4 players who play almost always together and this time they trolled the fifth guy.
You can see at his match history when he plays
and his team is

I don't play so often (few games a week) and when something near to this happen it tilts me but I try to stay calm because I know that those kind of players will receive a ban. Or will they ? :)