You can't really sue an entity that doesn't hold any assets. That's why it's been essentially impossible for companies that fight IV and win to counter sue. Eve

You can't really sue an entity that doesn't hold any assets. That's why it's been essentially impossible for companies that fight IV and win to counter sue. Even if they won the suit, the particular IV shell would just declare bankruptcy and get "reorganized" somewhere else. A worthwhile counterattack would either need to fix the patent system (hard) or go after the IV stakeholders personally in a way that would make the risks of their endeavor far outweigh any potential benefits (unlikely).