https://www.cnbc.com/2019/04/10/amazon-has-thousands-of-people-listening-to-snippets-of-alexa-chats.html

Amazon has thousands of workers around the world who listen to and review private Alexa conversations with the goal of helping improve the speech assistant's technology, according to Bloomberg.

The report said the Amazon team transcribes the recordings and shares the conversations with other parts of the company in order to make Alexa's "understanding of human speech" better.