It's a paid service, so you need to authenticate to use it.
You're a paying customer, not the product.
You're a paying customer, not the product.
I don't see why Kagi can't do the same.
Kagi is "a company created with the mission to humanize the web. Our goal is to amplify the web of human knowledge, creativity, and self-expression." Their goal is a search engine above all.
Mullvad's tagline right now is "A free and open society is a society where people have the right to privacy." Their goal is privacy exclusively in a VPN.
Paying for a random generated ephemeral account would be even better for Kagi but as far as I see it now, it's a privacy nightmare.
I recommend Kagi to follow the model what Mullvad has done for making a product privacy preserving while still being able to make money.