Twelve years ago Moto X was launched by Motorola, at that time controlled by Google. I had it and at any moment you could say "Hello Google, what time is it?" and it responded. I was constantly listening. All the time. And it was a perfectly normal phone regarding battery life or data usage. TWELVE years ago, imagine how much easier would be to implement that now, with more powerful and efficient chips and bigger batteries.

From an article about Moto X back then: "If you want to take a selfie, you should be able to simply say “Take a selfie!” In short, your smartphone should live up to its name. That’s the goal with the Moto Voice and Moto Assist software integrated into the second generation Moto X smartphone. And to do that, the Moto X is always listening, for verbal commands from the user and also ambient cues of the context. That emergent behavior is spawned by complex interactions between the software and hardware"

Only much latter I came to the conclusion that with Moto X Google was making its first tests on using the microphone for mass surveillance.

save you a click: it's in-app tracking and device screenshots. Don't install apps that have a working website. Also don't use Facebook.

“There were no audio leaks at all – not a single app activated the microphone,” said Christo Wilson, a computer scientist working on the project. “Then we started seeing things we didn’t expect. Apps were automatically taking screenshots of themselves and sending them to third parties. In one case, the app took video of the screen activity and sent that information to a third party.”

Out of over 17,000 Android apps examined, more than 9,000 had potential permissions to take screenshots. And a number of apps were found to actively be doing so, taking screenshots and sending them to third-party sources.

Checkout exodus privacy in case you didn't already know about it in order to check if any app you have has permissions to take screenshots or anything else.