I‘ve been using Kagi since September 2023.
The biggest difference to other search engines is really the quality of the results. Before Kagi, I‘ve used DuckDuckGo for a few years, but had to switch to Google more often than not, as I just didn‘t find what I was looking for. Most alternative search engines only use Bing‘s index, which just isn‘t any good in my experience. Kagi‘s results are built from quite a few different sources as well as their own index. Seeing how crappy Google‘s results are at this point, I don‘t think you can get better search results right now.
Also, the ability to rank and block specific domains in my results is something I really like and wouldn‘t want to miss anymore.
Lastly, I really enjoy using a search engine that isn‘t being optimized for advertisers, but for the user. Kagi‘s team is very receptive for feedback. For example, they’ve implemented an icon for search results with paywalls, because users asked for it. There are many small, nice details like that, which can save you a few clicks or just improve your general experience.
My educated guess would be that it would require a lot more work for very little benefit.
Officially supporting another platform is just more work for the developers, QA and the support team. Their games do run very well on Linux using Proton. Diablo 4 has even been marked as Steam Deck Verified before its launch on Steam.
And they work without them having to implement things like a Vulkan renderer, having to test on even more system configurations and having to teach the support team how to handle issue reports on Linux.
So I think they‘re okay with how things are right now. Everyone can play their games on Linux, but if something breaks, it‘s not their problem.
And, having played their games on Linux for many years now, I‘m personally okay with that. Proton, DXVK and all the other tools are so advanced by now, that I don‘t think there would be much of a difference if they offered native game builds for Linux.