It was a series on HBO. I highly recommend to watch it. You will know why very soon after you start watching ;). Truth in movies and lies in the news principle. And, it is even very well done.
Do not pay for that shit. If you want to watch, ping me and I send you a link where you can watch it for free. Or just go to lookmovie.io and type Westworld into the search bar. The movie is negletable while the interesting thing is: How did they make such a movie with such a topic so long ago?