I'm interested in only a handful of stereotypically STEM-adjacent topics. Out of 176 YouTube subscriptions, 2 of these are in my home language. And they are both musicians (= non-verbal content). Content dried up on 2 more that I've already unsubscribed from.
I'm using NewPipe instead of the official UI, so I know for a fact this stuff isn't being advertised at me. I pick my own feeds, and all the best content is English-based.
> Put differently, English-language videos comprised just 17% of the videos that were published by popular channels during the week, but they received 28% of all of the ...
or [1]:
> Of the top 250 YouTube channels, 66% of the content is in English, 15% in Spanish, 7% in Portuguese, ...
There's quite a distance between "all the best content in STEM field and on YouTube is in English" and "all the content is in English" and a lot of qualifiers gets in there.
I'm using NewPipe instead of the official UI, so I know for a fact this stuff isn't being advertised at me. I pick my own feeds, and all the best content is English-based.