

In my experience, Chat GPT is much better at the general programming patterns and concepts than specific API implementations. Especially less commonly used ones, where it often gives a solution that only looks reasonable but uses the totally wrong methods. I guess it’s similar with scraping the HTML of the Ubuntu releases page to get the latest torrent. It doesn’t know the exact HTML layout, so it guesses what is a likely one, even though it is wrong.
It is a public GPG key (not a Microsoft Publisher file) and while I don’t know, I assume it is used to verify that future updates are from Nvidia and not a malicious third party. It is really common (if not required) to install and trust a new gpg key when adding a new repository in Linux package managers, and done for safety reasons without privacy implications, and I am guessing this is what Nvidia is doing here.
Where do you see any indication that it is used for identification of you/your machine?