Jonathan Haidt just claimed that the pull-to-refresh behaviour in Mail on the iPhone was "literally" copied from slot machines. As someone who has written a book critiquing gamification, this seems totally off.
Pull-to-refresh debuted in 2009 with Tweetie, a 3rd party Twitter client, and subsequently patented. I can't find anything suggesting it was based on or inspired by slot machines.
https://www.newyorker.com/news/the-new-yorker-interview/can-we-save-kids-from-social-media
