From the announcement:
Under the hood, nearly all of today’s search engines are either built by, or rely on, results from Big Tech companies. In contrast, the Tailcat search engine is built on top of a completely independent index, capable of delivering the quality people expect, but without compromising their privacy. Tailcat does not collect IP addresses or use personally identifiable information to improve search results.
I signed up for the waitlist. I’ve been using DuckDuckGo for years and have been very happy, but I’ll still give this alternative a try to see how it compares.