Oh I do think that's why they do it. Otherwise, why put a movie in a small box inside an obnoxious background that is animated or moving video behind?
I've had video pulled for less, for instance, because a University was playing music over their speakers during a game which was going on in the background.
I've also watched movies where not only is there a moving background with the movie in the smaller frame but a commentator - the uploader, speaks and comments during the entire movie. Now THAT was and is annoying.