If people sign up for a course like this and then turn in work they copied from the Internet, I definitely don't want to hire them. Even if they weren't after the certificate. That's like cheating at solitaire. It's just sad.

Also, do you have any evidence that the no-cheating, no-publishing-homework policy is buried in a TOS? If Coursera hasn't made it obvious enough, then sure, people could have made a mistake. But Odersky's a smart guy so his reaction makes me imagine he made the requirement obvious.