FWIW as a counterpoint, I’ve been giving them money for 2 years now and every cent has been worth it a hundred times over. A shame that effective search is now a luxury item, but it is what it is.
if this search engine does not have its own index then the only mechanism it can use is to filter the search results of other search engines
this means that this search engine cannot give you more information than is contained in the index of the donor search engines
what exactly are you paying for?