I would say this is a blessing as it allows us to focus on things that matter to tech-savvy users (Kagi founder here).
> I wonder if they are interested in attracting users with more diverse searching requirements,
Yes, we are :)
> if so, how they would be able to actually reach them
Through our family plan [1], most likely. This is how I got my family members on board a paid search product.
I might add that "Kagi for Kids" is the first true attempt at having a search engine made specifically for kids, with a host of parent controls, which was never a thing in the last 25 years for some reason.
We are also seeing more and more users who are not techies (but are tech-savvy) becoming members. This may be followed by non-tech savvy users in the future. I do see the first signs of the age of ad-supported, "free" search, coming to an end [2].