I'm not a lawyer, and I definitely think the whole copyright system needs reform, but I believe there could be legitimate issues with the legality of publicly posting guitar covers as this person is doing on their channel. I'm not very familiar with the channel, but from the little I've seen, I believe the educational nature (and thereby fair use defense) could be debatable. Even if some of his videos are clearly edu…
In a legal sense, it is illegal unless they've paid the compulsory licensing fees.
That said, Youtube was once a place to find new stars who did covers, and many of them got famous. And now people who got famous like KHS do covers without any kind of issue.
https://www.youtube.com/user/KurtHugoSchneider
I just see it as the music industry locking the door behind the people who've already made it.