Kagi
Kagi depends on their being an open web to crawl. The incentive to publish on the open web is gone though.
Please read the article before commenting. It's not about what you think it is
In case you didn't read the article, it's about Google Adsense no longer being an effective way to advertise.
Kagi will be dead if google and alike are dead.
Buying access to web search indices is not the same as having one.
(I love them but this is the hard truth)