It's not a clever approach, it's basically scraping Google results because that's where your users are searching. You follow the bread crumbs from Google searches.
Cliqz entire history was based on this kind of thing, milking off other search engines by just deducting their ranking methods, it's parasitic. There's no cleverness about it.
I don't know a lot about this particular approach but your comment that it's just using Google results is blatantly false. It all depends on the search engine that the brave user is leveraging, or no search engine if they type in the URL directly into the header.
Cliqz entire history was based on this kind of thing, milking off other search engines by just deducting their ranking methods, it's parasitic. There's no cleverness about it.