How can one prove this for themselves? There's no way. OpenAI isn't open source. It's proprietary. There is absolutely no way for a person to establish exactly

How can one prove this for themselves? There's no way. OpenAI isn't open source. It's proprietary. There is absolutely no way for a person to establish exactly what's going on behind the web UI. A conversation could be entirely with humans, or just in part. You have no actual way to see for yourself other than using the Turing test. It's one of the fundaments of AI research itself, and you're calling it ridiculous? You're spouting nonsense.