A great way to realize how often smart devices record conversations without consent is to build your own. The ESP32 client I've made for my own voice assistant uses state of the art wakeword detection, but since I play a chirp and change led colors as soon as it detects it I know how often it misunderstands various noises or overhearn conversation as its wake word.

Commercial online assistants don't tell you when they've made a mistaken recognition, they run a silent second verification on the transferred sound - the nonconsensual recording - in their data center and just drop it.