Google Home's Assistant could one day know your mood. Take that, Alexa

"Huffman won't speculate on the types of regulation, but Jen King, director of privacy at the Stanford Center for Internet and Society, has an idea of what legislation could look like. She's currently researching the types of data collected through smart speakers.

She says we should all pay attention to what defaults Google and other companies set on their devices in the future, to make sure people aren't unwittingly giving up personal information.

"Google, for most people, is the gateway to the internet. These assistants further fill that role," King says. "The company shapes your experience, and they're going do so in a way that benefits them.""