They're attempting to establish the precedent today. Tomorrow(figurative, not literal), when such devices send everything to the cloud to be processed "To reduce false positives", there will be much more data to mine.
I won't have one of these devices in my house. I won't have an xbone in my house for the same reason. Today, they're not much of a threat to privacy but long term, the risk is too great for my comfort. They can't be trusted.