I had the opposite experience. I usually watch US/english content on Youtube, and only follow one or two german channels. Anyway, a new german video came out, but instead of their regular german content, it was in english. I thought it was a bit at first or a special video they tried to do for the english market. It wasn't until I logged in through another account that I noticed that Youtube had auto-translated the video to english - without any prior notice. Such an annoying and distracting thing to do unannounced.