Honestly didn't notice Kagi was US-domiciled. Their meetups I think are typically in Europe and their co-working and office space is in Belgrade.
Anyway, Kagi's excellent, their search results for me are significantly better than Google (and customizable), they've leveraged AI in a way thats optional and, to me, class-leading in its ability to help with search. "But we're EU based" is a product strategy that might land you some local government contracts and a few customers whose key motivation is negative emotion towards others but it's never going to be the path to great success. Spotify didn't conquer the globe because they framed themselves as an anti-US anti-iMusic or anti-Pandora or whatever alternative. They conquered because their product was solid. Nobody cared where it's HQ was.