https://www.vice.com/en_us/article/qvgpkv/microsoft-updates-privacy-policy-admits-humans-listen-to-cortana-skype

Microsoft has updated its privacy policy and other online pages to explicitly state that human employees or contractors may listen to recordings captured by the company's Cortana and Skype Translator products.

The move comes after Motherboard found contractors were listening to audio from both services, including sensitive and personal conversations of Microsoft customers, based on a cache of leaked documents, screenshots, and audio recordings. Apple, Google, and most recently Facebook have suspended their own use of human workers for each of their respective products.