I have a very simple solution to this but it is a bit expensive. I run two laptops, one that I talk to an LLM on and another where I do all my work and which is my main machine. The LLM is strictly there in a consulting role, I've done some coding experiments as well (see previous comments) but nothing that stood out to me as a major improvement.

The trick is: I can't cut-and-paste between the two machines. So there is never even a temptation to do so and I can guarantee that my writing or other professional output will never be polluted. Because like you I'm well aware of that poor impulse control factor and I figured the only way to really solve this is to make sure it can not happen.

That's an excellent point. It seems likely they thought they could operate as a proper reviewer, but when the deadline came, they took the shortcut they knew they were not supposed to take.

It really does sound like an addiction when you put it this way.

I think you're framing this behaviour too generously. Laziness is one thing, lack of integrity is another, and this seems to be a straightforward case of cheating and lying.