really???

The search engines you noted DO NOT rate Search engines - they provide the results of their searches (various sites, which may rate the Search Engines). These different sites provide their OWN ratings and results. Example if one of the Search results is Consumer Reports, and they consider Joe's Search Engine tops - that's on them. Of course, one may pick and choose and reply with those as..... your SHOCKER! really....
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Well golly gee willikers, I just did a search for the two words "search engines" and you're right! It pulls up a list, and nothing more. You know what's the first result on the list when I type those two words into Google?

17 Great Search Engines You Can Use Instead of Google

That's the FIRST result. Google is showing me the 17 alternatives to its own browser. Shocker isn't it?

Maybe because of metrics. That'd be my guess, since that's what Google says its results are based on.

It's not advertising itself, it's not promoting itself above anyone else, it's not pushing a political agenda on anyone. It's just providing results based on a complicated series of metrics. Just like most search engines do (some are just aggregates of other search engines results).

The only upside to DuckDuckGo is that it doesn't track your useage. That's it. That's the only benefit to it. And that's a really huge benefit, if you worry about your useage being tracked by the company you have chosen to use.

As for me, I know that Google knows exactly what websites I visit, since I use the Google Chrome browser and it keeps track of that stuff so that I can visit websites without lengthy load times.