Hundreds of thousands of people are showing ‘possible signs of mental health emergencies’ in their chats with ChatGPT, and millions more are probably oversharing. But there is something fundamental about talking to a human that cannot be replaced, writes Andrew Griffin I f a lion could speak, we couldn’t understand him," wrote Ludwig Wittgenstein in the Philosophical Investigations , published in 1953. He might just as well have said that if a large language model could speak, we couldn't