I'm skeptical that that is true -- mostly because I think they might absorb some legal liability from knowingly releasing something the US government has told them not to. However, I'm not an attorney and don't know this for certain. Having said that, I wouldn't wish that kind of problem on anyone...
Nor I...I'm simply speaking from what has been said. If I remember correctly, I believe it was stated that at least one of the developers has it in his contract to do so. Again, they are not my words and I'd hope no such thing would be necessary.