I didn't think of the form as "YouTube video", but you make a good argument. I divided it into the form "video" and expectations of the audience "youtube". Now

I didn't think of the form as "YouTube video", but you make a good argument. I divided it into the form "video" and expectations of the audience "youtube". Now I see it was arbitrary. Instead I should've thought of the distinction between technical limits of the form and non technical.