In months where you don’t utilize any searches on your plan, we will automatically apply a full credit to your account for that month. This credit will be applied to your next billing cycle, effectively covering your subsequent month’s subscription at no additional cost.
This old blog post summarises a lot of pain points: https://d-shoot.net/kagi.html
Similar to Brave (and more recently Proton) I simply can’t trust them, despite liking the idea of their respective services.