Is that meant to imply that the privacy protection and un-bubbling of the "middle men" is bogus? (I don't know about Qwant, but DDG isn't solely Bing, and it feeds some worthwhile organizations with donations.)
From ehat I've seen, search engines like Ecosia and Qwant aren't very clear about what they bring to the table, beyond serving as a proxy for Bing that doesn't store as much data on you.
I don't think there's anything explicitly wrong with that. But I don't think they really merit anybody's attention either. Especially since they don't explicitly advertise what they are.
I've been reseasrching some ideas.