[MateuszMucha]

Come on, IMO the guy had the right to assume this lectures are made by cool people who won't mind. And if they do, he'll take it down.

He created some value for a few people. Probably wrote a 5-lines-long bash script to download the youtube video, pull the audio out of it, add the mp3 to a repo, commit and push. He's done something nice, so that others won't have to.

You're asking him to ask a few dozen people for permission. Suddenly this becomes a project. And what if one person doesn't see the e-mail, forgets to reply, or it ends up in spam folder? The repo becomes incomplete and far less useful.

I won't use it myself, but I can see why somebody would. When I listen to something on Youtube on my phone and hit the power button to turn off the screen, it pauses the video. It doesn't pause the audio in pretty much any music player app.