You think most of the artists that made famous art got paid??

Yes, I do. Have you heard of Patreon? Do you know the word it's based on, "patron"?

Plus you think people don’t care if artwork that is claimed to be authentic is actually fraudulent??

People care about all kinds of things. Maybe instead of worrying about whether or not something is authentic, they should just think about whether they like it.

Thank you for demonstrating that you don't actually like art for art's sake, you care more about knowing your art comes from a famous person.