One pretends that they are doing something different and that they have great self-importance, and the other does the exact same process yet simply doesn't pretend. It may have something to do with the angle of the nose, and how much some think the rest of us can be easily seduced.
Again, the process is pretty basic. We can try to polish that turd, but that is still what it is; recognize a spoken word, write it down. The end. Nothing more; nothing less. Or just transcribe. There is no difference in the basic process regardless who might be doing it, although there are plenty that would like to make the rest of us think there is.
Think upscale restaurants. Often, the food is no better than what Guy Fiero visits on a regular basis. Maybe even not as good. But they sure would like us to think that there is something that validates the high prices, when often there is not. Expert wine connoiseurs, the best noses in the world (held at incredibly steep angles) have been tested, 10 months apart, on the same exact wines, and gave them staggeringly different ratings the second time. Pay no attention to that man behind the curtain.
And, trainman, what could make you think that CC that is delivered to me is any different from CC delivered to you? Or anyone else? We all get the same thing, and live in the SAME world, and there is nothing special about captioning from WGBH or anywhere else; all you have to do is watch This Old House with CC on (and captioned by WGBH) and you will see the same garden-variety bad captioning you see on CNN.
The only thing that bothers me about the truth is that it makes some of us uncomfortable. I am sorry about that. But the only thing that makes many of us more uncomfortable is pretending, trying to convince ourselves that some fantasy is the truth, instead.