This doesn’t suggest he’s reading your chats. We don’t even know if people actually use ChatGPT like this or he just thinks they do
Expect anything you say to GPT to be collected and used by OpenAI, and keep in mind that it could be read alongside your email address by OpenAI employees or government officials who request the data. But we don’t have evidence the latter is happening, and there are so many chats it’s most likely nobody notices or cares about what you’re saying.
Because it was great at predicting text messages!
I agree with Altman here - personally I think it's insulting to get sent a bunch of pointless extra words. Whether they come from chatgpt is irrelevant. Send me the prompt or the bullet points if you want to respect my time. Or write good sentences that convey your ideas clearly.