Like other search engines, Brave Search has a web crawler to discover new webpages and index their content. The index we create is independent of other search engines. Brave Search results are served solely from this index.
So far, it seems to me that they’re just stealing results from other search engines.
While “Google fallback mixing” is interesting in this context I do not see it being the root cause of the issue described by @eteszi .
Importantly, from my limited testing “google fallback mixing” is not a toggle-able setting for brave search outside of brave browser, and in a fresh install of brave browser (Android) “google fallback mixing” is disabled by default. Further I was able to reproduce the provided search query/result in both a non Brave browser using Brave search, and a fresh install of Brave browser with “google fallback mixing” disabled.
It is possible that the query provided by @eteszi was just something that Brave’s index had not yet fully covered so some indexed google results are floating to the top to fill that space.
I would also recommend using “Brave Rerank” if you do not want google results to appear at all in your search results.
After several months of development, Brave Search is releasing its own privacy-preserving image and video search that is independent from Big Tech search engines. Users will no longer need to leave Brave Search for image and video search results. Now any Brave Search query can be served directly from Brave’s own index, enabling users to benefit from a fully independent search engine that protects their privacy and is censorship-resistant.
I thought Brave removed all fallbacks according to this blog post from Aug 3, 2023