>All she has to do to file a counter claim is submit contact information of someone authorized to act on behalf of the works submitted, be that an attorney, friend or other business agent

This actually seems like a great idea for a business: DMCA takedown protection. Register your works with us, and we'll take care of the disputes and counterclaims. You pay us a signup fee for each work, and a fee for each work we successfully defend. In return, you get peace of mind and an agent familiar with the system to wrestle with claimants on your behalf.