There are many successful examples. One famous example is the google AdWords team (https://www.alexanderjsingleton.com/google-adwords-the-art-of-scrum-quintuple

There are many successful examples. One famous example is the google AdWords team (https://www.alexanderjsingleton.com/google-adwords-the-art-of-scrum-quintuple-constraint/ https://www.alexanderjsingleton.com/google-adwords-the-art-o...). Considering that AdWords became success after implementing scrum, you can say "it works". From my personal experience, Scrum does work but it requires a team that is competent already. A team of incompetent people will perform poorly in any scenario.