Nobody's forcing you to play it; you're free to delete the game. As for your "wondering", I doubt people won't play because of a 9GB download. It's 2026, nobody has 10MB internet anymore. I'm sorry if that's not your case.
But just in case your eyes are deceiving you, when there's an update, you can download that update (which is usually 2GB) and paste it into the game, without needing to download the entire game again.