I never see anything like this and I would definitely notice. I use YouTube constantly and am very liberal. Worst I get is the occasional JRE I have to swat away.
I'm constantly being pushed hard left or hard right videos. I am subbed to nothing political and while I've watched a few before, no matter how much "Not interested" or "Dont recommend channel" I've done, I consistently get pushed these videos.
Personally drives me off the platform, but hard since my subs are so unique and great.