Good news! It is illegal!
Political campaign-related autodialed or prerecorded voice calls, including autodialed live calls, autodialed texts, and prerecorded voice messages, are prohibited to cell phones, pagers or other mobile devices without the called party's prior express consent.
If you think you’ve received a political robocall or text that does not comply with the FCC’s rules, you can file an informal complaint with the FCC at fcc.gov/complaints. If you are receiving texts that you didn’t ask for, report the sender by forwarding the texts to 7726 (or "SPAM"). Campaigns should also honor opt-out requests if you reply "STOP."
I file a complaint for single one I get.
I think what you're proposing isn't something they can do. Are you saying "What if I asked it to create a short story who's pieces don't resemble any pieces of known stories?" or are you saying "What if I asked it to create a short story who's whole doesn't resemble any known stories?"
The first one can't happen. The second? Yes, it's stealing.
Where is it getting this story? LLMs don't have creativity. They don't understand story structure. It pulls sentences and paragraphs from work in it's training data. If the generated output contains work that others have made, that's called plagiarism. If it doesn't, then your hypothetical isn't realistic. LLMs can't create original works. That's the whole point. It pulls pieces of the training data and rearranges them. It would be like if I was writing a college paper and instead of writing anything myself I just pulled 100 different sources and copied a sentence or two from each source and structured them as my paper. That's 100% plagiarism.