Thank you so much for this info, Xur. Your email address suggests that you understand Italian. In a Youtube video, when a woman says "birra Corona", the automatic caption reads "vaffanculo".
So the folks in charge of the thesaurus that produces the autocaptions seems to enjoy "bad language internationally. But I didn't know about the restricting consequence you mention. This should be taken up with YouTube.
Back to your question : the uploader of a Youtube video can indeed authorize viewers to caption it using the Youtube caption editor: I'll add the link to the tutorial when I am back at my computer (I'm writing this on my cell).