I have been using closed captions for 10 or 1 years. News channels I guess use old court recorders or something but YouTube has new software that does real time encoding it is much better than any news I watch.
I’ve noticed that some CC is rife with errors, as if it is software trying to make sense of the noises of humans, and failing. They even skip entire sentences, as if that sentence wasn’t worth the effort.
I rely on CC because I have small, loud children. It’s a godsend.