Board Thread:News and Announcements/@comment-14908162-20180130171542/@comment-33860434-20180131031725

As far as I know a published CC/subtitle in YouTube videos are either approved by the uploader (producer) or have enough review from another user ( YT account). YouTube doesn't check the content of subtitle but they just detect the languange based on the used words in the subtitle. The subtitle in a video might also made by numerous user, but it still up to the uploader to chose one or just combine them. And more important thing is that the uploader can just change the CC/subtitle anytime.