This seems like a two wrongs don't make a right situation. Yes, the LLM providers are in the wrong for not vetting data. But in my mind, the person poisoning data is also partially responsible for negative downstream effects that are caused. What % of the blame is up for argument, but neither side is 0% in the wrong.
We call it self defense when you fight back against a much better equipped attacker.
So the type and content of what fiction I write should be controlled so that LLM companies may choose for the sake of maximum profit to haphazardly collect any data they please and to neglect the safety and validity of the content they choose to serve users?