"closed captioning" and "transcription" - just another method used by the deep state bury inconvenient information. (personal insight)
i can't provide too many details, but I can say this:
google (youtube) distributes videos and closed captioning around the world
closed captioning - let it be critically known - is also useful re: keyword searching the content of an audio/video file.
hint: some transcriptions are more accurate than others.
bottom line:
investigate it for yourself - especially at the API level, where bulk content is shared - youtube is very deliberately lowering the "accuracy" of the transcriptions/closed captioning on right wrong political content (Judicial Watch / Tom Fitton, just one drop in pools) - which has a direct impact on its further appearance in broader search results.
just one flip of one number will drop a transcription accuracy from 97% to 47% :)