https://www.theguardian.com/technology/2018/may/11/google-duplex-ai-identify-itself-as-robot-during-calls

Google Duplex, which simulates human speech with lifelike inflections, criticised as unethical

Google’s AI assistant will identify itself as a robot when calling up businesses on behalf of human users, the company has confirmed, following accusations that the technology was deceitful and unethical.