Legal way to fight anonymous registration

It's called due process. If you think someone is infringing on your trademark, committing fraud, or some other illegal or actionable offense, then you go before a judge and request the court issue a demand for that information. Yes, it's expensive. Yes, it's a pain in the posterior. Yes, that is as it should be. The more difficult you make it to pierce the rightful barrier of privacy of an individual, the stronger that barrier is and the less capricious that piercing can be. The courts are the place to go to acquire this information. The Markets make it profitable for legitimate companies to not hide that information.