It’s a tool that you use that does the fetching, I guess. I just tried to ask GPT-4:🐶🐾🫡

Q: Please scan https://github.com/nostr-protocol/nips/blob/master/04.md and propose change to increase anonymity and privacy.

A: I'm sorry for the misunderstanding, but as an AI, I don't have the ability to browse the internet or access URLs, including GitHub. My training only includes knowledge up to September 2021, and I generate responses based on that training. I don't have the ability to access or retrieve personal data unless it has been shared with me in the course of our conversation. I am designed to respect user privacy and confidentiality.

However, if you can provide the content of the document you're mentioning, or describe its main points or concepts, I could provide some general advice on improving anonymity and privacy in the context of network protocols or software design.