I absolutely agree that being "silenced" and feeling "persecuted" only serves to make extreme views more extreme. But I'm also not sure the bias is only directed one way as many of the far-right pundits would have people believe.
I also use DDG and avoid all things google as much as I can but the other day I searched "atlas" on YouTube (looking for the Greek mythological figure) and stumbled across a clip from the movie "Atlas Shrugged." I had read the book in high school and I know it's a favorite among conservatives so I figured it couldn't hurt to watch so I did, without thinking much of it. When I went back to my YouTube homepage later the recommend videos were very different from any content I would ever seek out: Jordan Peterson, Ben Shapiro, the Ayn Rand Institute, and even one called "Why Immigration is Bad for Britain." From watching one movie clip.
I think Google's algorithms, for better or for worse, can very quickly discern what content a user "wants" and filters out the rest. I'm the last person to have anything nice to say about Google but I do genuinely believe it's more a case of algorithms enforcing the unconscious bias/preferences of our brains than anyone at Google maliciously "silencing" certain points of view.
I do wonder if these are different problems tho. One could make a good case that they aren't, but I tend to think of search results as more neutral whereas video recommendations would be highly personalized. If I use the YouTube search box I'd expect similar results to everyone. But my expectations are based on nothing except my personal subjective sense of the way things ought to be.