Take Naver, the biggest search engine in South Korea that has higher market share than Google in South Korea (at least for now), for example. One of their main features is blog/cafe (which is their name for a forum) that users can create. This effectively works as their exclusive feature, as searching them outside of Naver is horrible (not that Naver is any less horrible itself, though). Of course, that's not what I'm suggesting, but that's how Naver gained its users ever since the beginning in the early 2000s: by providing unique and higher quality information when it was scarce.
This can be a great feature, really. But I'm concerned about these two things: 1) it should be available for paid users only, otherwise too much of Kagi's time and effort would have to go to content filtering, and 2) if it's going to be paid, do I really want to host my blog on a paid subscription service that I may not continue to use in the future?
We do have to keep in mind that pretty much all Kagi users are at least somewhat tech-literate and GitHub/Cloudflare Pages are a thing. The Kagi userbase is still very small, and I don't see how this will be worth the effort.