It’s not. On the one hand is however many people saying “it’s obvious!” and on the other hand is no evidence of network traffic transmitting audio data. Why spend all the power to transmit audio, autotranscribe, and parse for specific keywords when they already track your browsing habits and those of your housemates?

You should look into Karagarga

Why is everyone talking about the golden raspberries and not these jumbo sized hand fruit blueberries you’ve got going on?