Well if you wanted to support the idea of paying for your product, you could totally decide to limit Kagi to 10$/month, and switching back to a free (as in "you are the product") alternative when your credit is finished.
Now I'm expecting you to potentially say "I would pay 10$, but I refuse to have to go through the trouble of changing my default search engine twice a month", which brings me an idea:
Actually Kagi should maybe offer that option: after you're done with your monthly credit, they redirect everything to the free engine of your choice. That would provide an easy way for people to support them with the amount they are willing to pay, without having to change anything in their setup.
