https://www.vice.com/en_us/article/vb5mb4/humans-listen-to-cortana-leaked-documents-show-poorly-paid

"Stop listening to me" is one example of a command a Cortana user may utter, according to a training manual for the human contractors Microsoft hires to listen to and classify users' speech.

Apple, Google, Amazon, and most recently Facebook have been found hiring human workers to transcribe audio captured by their own products. Motherboard found Microsoft does the same for some Skype calls, and is still doing so despite other companies suspending their reliance on contractors.