It's not a DMCA thing at all. DMCA 512 is actually pretty straightforward, you're referring to YouTube Content ID, a completely separate parallel takedown system that YouTube made at the behest of their content licensors.
If the media companies had their way, everything would work like YouTube Content ID, because that's the system that minimizes their enforcement cost. What they want is to make everything Someone Else's Problem.
If the media companies had their way, everything would work like YouTube Content ID, because that's the system that minimizes their enforcement cost. What they want is to make everything Someone Else's Problem.