I just learned of this little gem:
https://mcbroken.com/
"A 24-year old software engineer, Rashiq Zahid, built the app by fiddling with the McDonald's API."
"Here?s how it works: McDonald?s keeps track of which locations have a broken ice cream machine. If you try to order ice cream at a given McDonald?s, and its machine is broken, you can?t add the items to your cart: They?ll be marked as unavailable. So Zahid?s app places an order ($18,752 is the total worth) every minute at every McDonald?s in the US. He?s not paying thousands of dollars, of course?he?s merely seeing whether his orders go through."
More to the story here:
https://www.entrepreneur.com/article/358445
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* Origin: Telegram to fido gate by Stas Mishchenkov (2:460/58)