There are any number of devices in your home that are capable of responding to voice commands once enabled. This actually has nothing to do with Siri, Alexa et al, but to do with all of the apps that require ever increasing access to various elements of your device capabilities in order to allow you to install them. Pictures, cloud storage, call details, camera to name a few. My 12 month old TV is voice command capable as well as being internet connected. I am essentially trading my privacy in return for a TV that streams Amazon and Netflix.