Amazon just sold out Luca Guadagnino in a major way ... scrapping his nearly-finished Sam Altman film after partnering with Altman's OpenAI in a $50 billion deal ... TMZ has confirmed. The movie, "Artificial," stars Andrew Garfield as Altman -- the OpenA.I. CEO -- and it reportedly tells the story of his short-lived firing from the company. An Amazon spokesperson tells TMZ in a statement ... "We have the utmost respect and admiration for Luca Guadagnino as an award-winning filmmaker — not to