Maybe it’s because it was in the same language group as those others that polish got singled out. People who speak an Indo European language will expect to be lost when first trying to learn a language outside of the group, but might not expect to be so confuddled from a related language. Expectations basically.
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.