The studios grant limited time licenses. Netflix basically negotiates with them how much they will pay for providing the movies and for how long. Once the contr

The studios grant limited time licenses. Netflix basically negotiates with them how much they will pay for providing the movies and for how long. Once the contract expires they remove it, unless they renegotiate for next term. Because Netflix was first and is most successful (I'm guessing Amazon Prime is 2nd) they movie studios are extra demanding how much Netflix should pay them. Some of them even right away refuse to share because they either are competing or investing in a competitor. Because of the pain these studios provide, Netflix started making its own content as well. Basically all the unpleasantness you have in Netflix (missing, removed content, regions restrictions etc) is due to studios trying to milk as much money as they can from it.