Tangential:

I have recently noticed that e.g. ChatGPT, when used from a web browser, periodically sends unfinished prompts to their servers, namely to the `conversation/prepare` endpoint, without waiting for the user to actually send it.

This partial prompt data might potentially be used to "pre-warm" some kind of cache.

But it may also be used to track the user's writing cadence, error correction style and evolution of their stub ideas as they are being formulated into a prompt. I would assume that such data could also be sold to the advertisers.

I wouldn't be surprised if their privacy policy would say "what you send is private" and then it wouldn't apply to unfinished prompts on technicality