Ask HN: Harvesting Call recordings

Hello HN, this is a genuine doubt I had this morning. Everytime we call customer care we have a small announcement that the call is being recorded for quality and training purposes. But are they strictly used for that or is there some machine continously tagging the voice of each individual? because during the feedback the Customer rep knows the emotion even the emotion can be tagged. If this is happening is it legal/ethical? Can the data be useful? Can this data be aggregated from various providers to target each individual's emotion and identify their mind state or other metrics?