Users failing to recommend shows on your platform to possible new users because they were canceled without a resolution. “The OA” is perfect example. Netflix won’t make another dime off that show because anyone that has seen it will adamantly steer people away and anyone that googles it and sees it was canceled on a cliffhanger will have zero interest.
Shows don’t need to run forever, but they need to finish them. If that is 1 season, fine. If that is 6 seasons and a movie, great. But I’m not interested in a show that just stops airing without an ending, just like I’m not interested in reading a book where the publisher just stopped printing chapters at some random point.