Which is ultimately caused by the "attention economy" and that most providers don't get paid by their end-users but instead by advertisers. The service of let's say YouTube is
not to provide a place for end-users to upload videos but to provide advertisers with a way to put their spam in front of eyeballs - the content that end-users upload is merely a necessary evil they'd gladly get rid of if they could find some other way of driving traffic to the spam.
Even in a perfect world where the DMCA is "balanced" and any abuses are properly punished, this problem wouldn't go away - the platforms will merely provide alternative means for advertisers (and anyone else who's happy to pay) - their real customers - to take down whatever content they want. It will merely become a bullet point in their list of features that they offer to paid customers, completely independent of the DMCA (and thus wouldn't be subject to whatever the DMCA says).