I had been using YouTube for years without being presented rightwing propaganda in my suggestions. I mostly just watched strategy gaming, history, technology channels and some peculiar travelling blogs. And my suggested was just mostly those things.

Then one day I used my YouTube account to cast kid shows for my niece for the first time. After that I was suggested more kid shows which didn’t interest me personally, but I also started getting suggested cat videos, which I obviously clicked. And the week after that half my suggested feed was rightwing misogynist/racist/culture war misinformation, and it took a lot of “do not recommend channel” to clean it up again.

So now I believe that there is a concerted effort by some malicious actors to train Google’s algorithm to assume that if someone is interested in cat videos, that they would then also be open to becoming a misogynist racist prick.