Because only the actual copyright holder of the content can counter-sue and most either don't have the resources to counter-sue or also work in the entertainmen

Because only the actual copyright holder of the content can counter-sue and most either don't have the resources to counter-sue or also work in the entertainment industry and are ultimately beholden to the same people sending the takedowns in the first place. I can't wait for someone to finally start taking fraudulent DMCA takedowns to court.