Too easy for bad actors to create multiple accounts or game this system. I think this would end up hurting genuine claimants of actual pirated works more that it would help the wrongly accused.

If you're a genuine claimant, you have little to worry about because you don't make false claims.

That's putting a lot of trust in YouTube that they'll find every claim you make to be valid. Someone could make a dozen accounts with a dozen duplicate/similar versions of your song, you dispute all of them, are found in the right on 9 claims and in the wrong on 3, your account gets 3 wrong accusation strikes and you channel gets banned while the other person then marks one of those knockoffs as the official one.