How would you have suggested that they address the problem? I mean, if Valve acknowledges the Commission's contention that they're complicit in what people do with these items, whatever measures they take to comply would potentially extend to all content that drops randomly and is purchaseable and tradable. (If it meets those criteria, someone can "gamble" with it, and if they do, that's apparently Valve's responsibility?). None of the attempted fixes I can think of seem very satisfactory. (Why should legitimate users - the vast majority - have to suffer the consequences because a handful of profiteering assholes are determined to scam the system?)
Personally, I think the stance Valve is taking with this (terminating accounts associated with gambling sites, offering to work with the Commission to identify other such accounts and shut them down) seems like an adequate response to the issue. I'm hoping