[cowpewter]

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.

[Karunamon]

Also, (please correct me if I'm wrong), another hurdle is that you must prove the notice was sent in bad faith - not an easy task.