Although you mean well, this is absolutely not the move or helpful. "read lots of books or fanfics and learn how to recognize moments where your writing sounds ChatGPT-y, and rephrase them." AI is trained off books and writing. People should NOT have to change how they write just because you think it sounds like AI. Where do you think the AI got all that writing from. Unless you have concrete proof other than vibes and assumptions, do not start hinting or accusing artists of using AI. At best it's unhelpful and at worst its inciting harassment.