Kagi's business model also aligns incentives better than an ad and/or data mining fueled business model. Of course, this isn't proof, but it is evidence. One can also try the search in areas that one knows deeply and compare it to other search engines to see if it's truly better (I have not done this, but it is possible and isn't just trusting marketing.).

I don't use Kagi primarily because I'm quite averse to subscriptions if I can find another way.