For the love of all that is unholy do not
DO NOT
feed another person's text into a #LLM (or quote-unquote ✌️ #AI ✌️ ), grammar checker, Google Docs, online document processor (like ebook formatters or PDF splitters), or any other online-connected platform where it will/may be harvested for ✌️ AI ✌️ training data.
You need the person's express and informed consent to do any of the above, because once that text is sucked up for training data it CANNOT be removed for all practical intents and purposes. Not only is the use of copyrighted materials for training data so legally dicey there are multiple huge lawsuits on the subject, these models are prone to outright regurgitating parts of their training data--people don't call it the #plagiarism machine for nothing.
If you're unsure whether you may use software or website that the author didn't use or otherwise consent to, JUST ASK first. It's not hard, and it's just a basic decent thing to do. Jesus fuckin Christ.