We index anything we consider authentic and contentful, but our category interface (mostly) consists of small web pages. Happy to hear any feedback.
We have substantial lists of approved and denied domains so the authentic content is definitely there but it's not visible from a few clicks off of the categories page, we have more work to do.
From https://help.kagi.com/kagi/why-kagi/noads.html:
“Kagi Search is an ad-free search engine that will actively down-rank sites with lots of ads and trackers in the results and promote sites with little or no advertising”