Related discussions:

https://news.ycombinator.com/item?id=24861623 - October 2020 - "I reverse engineered McDonalds’ internal API" - (Orders ice cream at every McDonalds to see if the machines are broken)

https://news.ycombinator.com/item?id=26936774 - April 2021 - "Investigating why McDonald's ice cream machines are often broken [video]"

https://news.ycombinator.com/item?id=28386567 - 1 day ago - "The Feds Want to Know What the McFuck Is Going on with the McFlurry Machines"