There is I think one distinction in the analogy to be made. We shall not put the sign of equation between services offered by Kagi and Google, because we are not for example doing the same for Netflix and Youtube.
One may pay Netflix because there are _specific_ shows that they can not get anywhere else, or simply because the quality and convenience is much higher than if they tried to watch those or other shows in different ways, including free.
In similar fashion, Kagi offers a completely different product/search experience to Google, with different results, different features and attention to detail like you would expect from a premium service obsessed with user experience. Saying that Google is offering same thing like Kagi but for free, is ignoring this nuance and is same as saying that all streamed video content is the same, or that every comedy show is the same.