https://en.wikipedia.org/wiki/Online_Copyright_Infringement_...
In effect, the YouTube copyright system is a purely "voluntary" system for taking down copyright content, that goes way beyond the DMCA. It's basically designed to ensure theres no possible repercussions for issuers of copyright claims, even claims clearly made in bad faith.
The differences between these two systems are explained here: https://support.google.com/youtube/answer/7002106
> has adopted and reasonably implemented, and informs subscribers and account holders of the service provider's system or network of, a policy that provides for the *termination* in appropriate circumstances of subscribers and account holders of the service provider's system or network who are *repeat infringers*
https://www.aclu.org/documents/text-digital-millennium-copyr...