How an Amazon Echo ended up recording and sharing a private conversation
https://www.vox.com/2018/5/25/17393870/amazon-echo-alexa-privacy-recording-conversation
The short answer: Alexa misinterpreted background noise as a command.
How did an Amazon Echo end up recording a couple’s private conversation and send it to an acquaintance without their knowledge? Alexa apparently misinterpreted some of the things they said.
They had a listening device that was connected to the internet, that's how.