Shame on DDG for endorsing this nonsense. I understand the quest for a larger userbase but please don't use this sort of FUD that is being peddled by those who don't understand the technical aspects of search and are trying to sell their books. A search engine's prime function is to filter the millions of results for each query down to the most relevant results for each individual user, and never the same 10 results…
I think you missed the point. Yes DDG ranks, but it may rank differently. Of course, there is an implicit slam on them here: instead of showing you what you want the vast majority of the time, they show you other stuff. This is good on occasion (so you don't live in an echo chamber), but if this was all the time it would mean lower quality search results for simple things.
My own standing is that most of the time you need what you have to have to complete task at hand. Then you could go at YouTube and refresh "Recomendations" to your heart content.
The other way around is to wreak havoc to important parts of your life.