… Because based on their manifesto, that’s exactly what Kagi wants to do with you as a search engine; show you the things it thinks you want to see.
no, based on your interpretation of the manifesto. I already mentioned that the direction that kagi has taken so far is to give the user the option to customize the tools they use. So it's not kagi that shows you the thing you want to see, but you, who tell kagi the things who want to see. I imagine a future where you can tune the AI to be your personal assistance, not the company.
Every giant corporation has a privacy policy
It is not having a policy that matters, obviously, it's what inside it that does. Facebook privacy policy is exactly what you would expect, in fact.