Earlier quoted context omitted.
Knowing more might not improve your accuracy but it's not going to harm it. Forcibly forgetting true parts of your knowledge seems far more likely to have unintended consequences.
One obvious consequence: the model might still produce copyright infringement because it thinks its creative ideas are novel.
I get that "first to publish" matters to a lot of people, but, say 5 unrelated people are writing unique screenplays about a series of events that seems important to them or culture or whatever; if they all come up with very similar plots and locations and scenes, it just means that the idea is more obvious than non-obvious.
Please, argue. I haven't fully reconciled a lot of this to myself, but off the cuff this'll do.
The logic being - if an AI without taint produces some other work, that work drew on the same information the model did, and came to the same "conclusion" - which means with a time machine, you could wipe the LLM, go back to the period of the original work, train the LLM, and produce the work contemporaneous to the original. Hope that made sense.