DMCA replaces the scary letters. YouTube only responsibility is to collect claims and counterclaims. Common YouTubers can just accept the claim and mute content. Youtuber wanting a fight or that know the other party would never risk their frivolous challenge to go to court with the threat of perjury hanging on their head have a right to counterclaim and put the ball in the other party field.

YouTube instead decide to act as jury and will allow claimant to counter the counterclaim, and here lies the crux of the issue.

YouTube isn't protecting poor youtubers anymore than what DMCA already allows; YouTube is instead actively removing youtuber right to challenge the claim, putting all the power in the claimant, far above what DMCA mandates or requires.

And that decision to act as jury and judge and final unappealable authority in the claim process lies squarely on YouTube shoulders.