How would you go about getting that information on existing blogs? A great many blogs have 'blogrolls' but scraping that information seems far more time-consuming than it ought to be due to the variations in layout etc. etc.
Wordpress-based blog proprietors are likely to maintain their blogrolls using Wordpress’s Links feature. Because this is a standard module that produces more or less the same output across all WP blogs, it is rather easy to parse for and scrape.
However, if this Show HN tool is for static-site generator-based blogs, then individual bloggers may have more leeway on how to format their blogrolls.
I'll give that a look. It's been a while since I checked into it but I've been wanting to map a particular blog network for a long time so that sounds very helpful.
