Why was closed captioning traditionally done by service companies instead of in-house?
In the past, it was not feasible for most facilities to bring closed captioning in-house, due to the very high cost of the necessary hardware and software, as well as specialized training needed to run the system. However, recent advances in affordable and easy to use closed captioning software encoders (which eliminate the need for expensive hardware) have made it possible for anyone to do their own closed captioning, right from their NLE system.