If you invest 80 million and make 80 million in return, it’s a wash, and you wouldn’t pay any taxes because you didnt make any money.
You would have to invest 80 million in a movie, scrap it, and then 80 million in another movie, which goes on to make 160 million in order to have 80 million in profits to offset with an 80 million write off. This would result in a net $0 made for tax purposes.