I think anyone's response to something like this would be highly contextual. If an intern steals propriety tech and releases a related product before we've hit the market, I'd be calling my lawyers.
On the other hand, if my product is a generic tool then I don't see any reason to react. People make clones all the time. If an intern doesn't do it, someone else is going to do it. How many people am I going to try to stop?