https://www.entrepreneur.com/article/332099

When interacting with Alexa, you aren't talking to a human, but that doesn't mean to say other humans won't hear what's said. In fact, Amazon has thousands of people listening to our Alexa voice recordings every day.

It may, or may not come as a revelation to you that what's said in the vicinity of an Alexa smart speaker or display can be recorded and sent back to Amazon. As Bloomberg reports, there's a big human element to Alexa, and it's vital for the smart assistant to continue getting better at its job.