An interesting problem with Kagi's basic model is that it ties up search history with an account in the financial system which adds failures not present when using something like Google or DuckDuckGo. But, since they accept Bitcoin, it is actually possible to wash the payment through a privacycoin and disassociate everything again. So there is a use case for crypto here that isn't obvious at first glance.
> Kagi does not log and associate searches with an account. https://kagi.com/privacy
If you're going to start trusting search engine companies then maybe don't have them linked to your bank account. They can put what they like in a policy document but the problem is what happens when they decide to start doing things differently.