this is an angle we honestly didn't think about (we are pretty much long time lurkers) but accessing existing HN content is a great idea! I didn't even know there was a page of upvoted submissions :) It doesn't look like thats available via the API, but a copy paste of some text should work just aswel, all we pass through is titles and urls to the LLM anyway to generate the profile so its much the same.
More generally a next feature we want for ourselves is a way to add just some generic text and "update" the profile with that, rather than generate it fresh exclusively off of the 30 examples. This circles back to us using this as a focus point to think about what data is enough to generate a good user profile, and what good is.
Given the nature of the small pool(And the way they naturally exclude / includes topics), I'd strongly prefer if it had some way of adding more than 30 samples, maybe keep track of each set calibration taken and compare?