Exactly - can't you see that this would cost Stern a lot of time and money, for very little benefit and probably a lot of extra work / headaches?

Also, it would be bad to say Stern should just deny support to open source modified games. They would get many support phone calls, where the caller would probably say "it's the original code", only to discover later after wasting a bunch of time that the game was using modified code. Ultimately Stern would end up denying support to older games, that they are currently nice enough to assist people with via phone support even though they are out of warranty. They would have to get more strict about support, because of all the wasted time.