A list. A list containing the names of every player who deadbeats. Next to their names, the number of times they were kicked from a game by becoming a deadbeat.
I believe this will greatly reduce the number of games that people end up playing that involve those who deadbeat. Also, with the ignore list, it gives every player the ability to choose their own level of defense. Do you judge quickly and ignore every deadbeater, or do you just ignore the top ten twenty or thirty? You decide.
Eventually, those who deadbeat frequently will find themselves all alone, no one's time to waste.