I would like to think that YC mostly funds ethical people, but that makes AirBnB the worst exception so far. After http://news.ycombinator.com/item?id=2603844 I would expect them to stoop to anything not likely to lead to prison time (and unfortunately the CAN-SPAM act is is pretty useless).
You really should not say this sort of thing when you only have half of both stories. The Airbnbs are not only among the most upstanding people we've funded, but among the most upstanding people I know.