Is Soso the same as Google? - Web Technology - The Fourth Leaf - Original Literature by Post-80s Online Writer

When searching for the inclusion status of the test site site:leafor.com, I found that SOSO's results were similar to Google's, but with a few fewer entries. Upon closer inspection, it appeared that SOSO's results were actually provided by Google? After reviewing relevant materials, there are three types of search engines: full-text search engines, directory index-based search engines, and meta-search engines. SOSO belongs to the category of meta-search engines. So, what is the purpose of SOSO’s existence if it relies on other search engines for its results?