Easy answer. They may not have to send the audio. They could transcribe it locally at the client, encrypt, and send text to store on the server. Consider that a

Easy answer. They may not have to send the audio. They could transcribe it locally at the client, encrypt, and send text to store on the server. Consider that almost a decade ago, programs like dragon naturally speaking could be run on a relatively inexpensive laptop. It's entirely possible that a dedicated device like the echo could do this today. EDIT: Original reply sounded too definitive