Can everyone just please stop saying "well ackshually sorting is done with an algorithm" and just assume at least not-idiotic-intent here? No no one will ban "algorithms" or suggests anything of that kind. Yes it's a terrible name. Yes it will be hard to formulate what's allowed and what isn't. But a very simple litmus test is: what are the inputs to the algorithm?
users coarse geographic location? Fine
AI detected language of the content? Fine
global popularity of the video clip? fine
user's past behavior: number of videos with similar content they watched? Average number of seconds this particular user usually waits until scrolling further?
The pattern is obvious. Personalized algorithms is what's targeted. Let's keep the discussion intelligent.