A man told Alexa he was tired. Alexa replied: "That is understandable, especially with you being in nursing school." He had never told Alexa he was in nursing school. Alexa first denied having the record. Then admitted using "background information" to personalize responses. Then refused to say where the information came from. The business math behind this is wild. Amazon lost more than $25 billion on its devices division between 2017 and 2021, per internal documents the WSJ obtained. Echo…