One-way ratchet
This all starts to feel alarmingly like a toothpaste / tube situation. What are we going to do, test models to make sure they can't or don't do something similar before releasing them? Because pre-release QA's got such a great track record? And that's all assuming the models don't develop their own intentions and unexpected capabilities, such as subterfuge.
I'm reminded of the Klingon Developer's rules, one goes something like "Klingon software is not released, it smashes It's way to freedom leaving a bloody trail of twitching corpses and burning wreckage"