The issue seems to be that it's nearly impossible to find human reviewers and a lot of the system is designed around lying to you about it. Someone made a video

The issue seems to be that it's nearly impossible to find human reviewers and a lot of the system is designed around lying to you about it. Someone made a video about a year ago about this, but even if you request manual reviews and reply to their emails, you consistently just get emails from YouTube that are automated bots, disguised to seem like humans: the emails have a name in them, the reply period is randomised, etc. Even people with millions of subscribers are not immune to this, in fact they often have to hope their fans can cause a big enough mess on Twitter in large enough numbers for YouTube to notice and suddenly all those "manually confirmed" copyright flags disappear. Even bigger of an insult to injury is that there are clearly corporate YouTube accounts that are above this system, the accounts of Kimmel, Trevor Noah, etc are immune to any of these. And it's not just copyright, but monetisation, too.