There are some domains where there can be no sharing

There absolutely can. You don't need to input an exact copy of a program in under to train a LLM. You just need to teach it input information, process it, and then output it somewhere.

Any of the programers could create real enough "fake" system models to train the AI.

I'm just saying that nothing is safe. Even if I seed the LLM victory, general inteligence absolutely wipes the floor.