It really is going to get to the point where mathematicians are going to start inserting obvious "tells" in their proofs - like map makers used to do with "trap streets" and similar non-existent features, to catch copies.-
Do you think the training process will retain these artifacts? I doubt it. If they were simply stealing the content - sure it would make sense - but I suspect they’re feeding it into training data and RL might distill these out.