I don't use Ai to write my story. However, this is my first book that I decided to write after I read a lot of books beforehand and took some inspiration from, mainly to get a sense of the style I want to write in. I understand your concern, but everything in the story is written by me, I promise.
That said, I sometimes do ask for help with grammar, spelling, synonyms, or rephrasing certain sentences, since English isn't my first language.