Silver, Game of Thrones was based on a series of novels and the only way that writer would consider his work being put into film is if his work was not condensed which would have left out a lot of what he felt was important about his work. He explained that his work was expressing a lot of human emotions and included how violent human beings can be as well as cruel and savage. It's about those who covet power and those who have it and what they do with it.

"Game of Thrones": "60 Minutes" goes behind the scenes ahead of season 8 premiere - CBS News

Hope this isn't hyjacking, just watched this on 60 minutes and it explains why the author allowed what became the very popular series shown on HBO. The author explains why he would only allow his work to be put into film if it was done in a way that reflected all of his work instead of condensing it in this segment as I have mentioned.

I found it interesting as I had not watched or followed it myself, too violent for my taste tbh.