So does that mean that any artist which has viewed another piece of art and learned from it, and used that knowledge in their own works, has therefore committed plagiarism by not asking for permission or crediting every work they’ve ever seen?

I’m an author and one of the most common pieces of advice for authors is to read more. Reading other authors’ works teaches a lot about word choice, character development, world building, etc. How is that any different from an AI model learning from art pieces to make its own?