https://www.theregister.co.uk/2019/04/11/amazon_staff_listen_to_alexa/

Sneezes and homophones – words that sound like other words – are tripping smart speakers into allowing strangers to hear recordings of your private conversations.

These strangers live an eerie existence, a little like the Stasi agent in the movie The Lives of Others. They're contracted to work for the device manufacturer – machine learning data analysts – and the snippets they hear were never intended for third-party consumption.