[Tainnor]

Why do you think it's rare to want to watch something in a foreign language?

For the vast majority of people on this planet, English is not their first language (if they speak it al all), and their command of English may often not be good enough to comfortably understand all of the content they might want to enjoy. And it's still the case that most content on such platforms, and certainly often the most viral one, is in English.

And even beyond that, people sometimes learn other languages, in which case watching something in the target language with subtitles can be a very helpful step.