LLMs can provide original output, but they can also make errors. You’d have to prove it meets the grounds for plagiarism, and to my knowledge no one’s been able to. It’s all been claims with no substance or merit so far.
It’s more like reading a book and then charging people to ask you questions about it.
AI training isn’t only for mega-corporations. We can already train our own open source models, so we should let people put up barriers that will keep out all but the ultra-wealthy.