Because closed captioning (generally) has to be manually typed out by listening to audio from the show or movie.
Studios often include the CC in major releaaes like movies and such, but for tv shows, it would take far too long to have a team of people constantly working to make captions for each weekly episode.
So, they outsource to data entry companies, who split the episode in 22, 1 minute files, and each minute file is transcribed by a person
They then put them all together, and provide them to the network broadcasting the show
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