Hollywood has always done that. Most of the early productions were filmed plays. Some of the biggest movies in Hollywood’s history are remakes, based on other sources or both. You like Charlton Heston’s Ben Hur? That was the third time they made that movie, based on a play, that was itself based on a book. Humphrey Bogart’s Maltese Falcon? 3rd time they converted that book in 10 years.
100% original movies with no previous source of any kind have always been the rarest thing in Hollywood, anybody that thinks it’s new needs to watch the classics.
Thanks for the feedback, and you are right on target re watching the classics.