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That same article explains how those "snatches" of audio are primarily garnered because of words that sound like the wake word the user has chosen. I've still not heard any convincing evidence of an Echo device just randomly "listening" (let alone transmitting) without at least believing a wake word had been spoken.
I expect everything I say after "Alexa"..." to be used by Amazon (algorithms or humans) to improve the service. I wouldn't own one if I wasn't OK with that.
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