Kumikommunism already talked about manufacturing, but they do (/could be used to do) a lot of optimisation in infrastructure - stuff like ai-controlled traffic lights to relieve traffic flow, detecting vibrations in buildings or bridges to predict where preventative maintainance will be needed, energy demand prediction and distribution - stuff where the data sets are naturally massive or require extreme precision are perfect for AI. Then there's the ai-powered "dark factories" that just need some attention from an engineer now and then, operating almost completely autonomously.