There's also a game about the subject.

http://www.decisionproblem.com/paperclips/

Other articles that help really grok the general idea:

https://www.lesswrong.com/posts/HFyWNBnDNEDsDNLrZ/the-true-p...

https://www.lesswrong.com/posts/mMBTPTjRbsrqbSkZE/sorting-pe...

IMO Universal Paperclips is one of the the best clicker games, even without the AI safety elements, because it has an end that is reachable in a reasonable amount of time.