Earlier quoted context omitted.
It's not a matter of "thinking about it"; captioning is difficult and expensive, and if we force universities to caption educational materials they release * for free *, we're incentivizing them to never release these materials again.
HN is a community where people solve difficult problems for a living. So someone using "difficult" as a reason for something doesn't really fly with me. As for expensive? I'll agree. Going cost is about $1 per minute minimum. And they're not releasing that material "for free." Make no mistake - it's either because they got a grant (that's what we face) or part of some marketing thing. I apologize if it sounds like I'…
So slowing down the video to half speed, means a half hour video takes an hour to transcribe. At a labor cost of $15.00 per hour, that is 25 cents/minute of video. Much less if it is off shored.
Edit: Would it be helpful if Google added a captioning interface to YouTube? That is, an adjustable playback speed (which they have now, but I'd like to see more speed levels), and a capture window where users (volunteers) could provide captioning of any video, including educational ones.