This is pretty cool. I tried Kagi once and liked it, but ran out of my monthly search allowance within a few days. Apparently I make 20x more searches than the average user... So even if I paid, I wouldn't have enough. And I don't like the idea that I'm paying for every web search. It'd add a weird friction that I think would inhibit my flow.
Admittedly $10 still seems kinda steep for something I get for free already. But maybe I should just try it out for a month and my mind might change.