Not AI, but similar sounding incident in Norway. Some traders found a way to exploit another company's trading bot at the Oslo Stock Exchange. The case went to court. And the court's ruling? "Make a better trading bot."
But you are right, they appealed and had their appeal upheld by the Supreme Courts: https://www.finextra.com/newsarticle/23677/norwegian-court-a...
I am so glad at the result.