My configured primary language is English, but I regularly watch contents in Chinese and Japanese, where I have sufficient mastery over to not need YouTube's subpar translation. YouTube's insistence in displaying video titles in English, starting a few months ago, and now also auto-dubbing in English, is incredibly annoying.
Similar thing for me with Spanish and English. I consume both basically equally. I don't need audio or text translations for either, but Google insists on translating the english titles to Spanish completely ruining the entire meaning of what it is. Strangely I often get things in Portuguese for some reason even though I've never set a device to Portuguese, I just happen to have been to Brazil and Portugal.
I wish I could just say please never translate either of these languages, and while some apps have this many are very hostile.
I also have a weird setup where all my personal devices are in Spanish but my work devices and accounts are in English. It causes a strange mixup where I never really know what language I'm going to be served but its wrong more often than not.