Due to ICANN's new policies if you report incorrect or inaccurate whois data the registrar is forced to investigate and potentially pull the registration(s).
This will probably force the problem maker to go to a new registrar and also pay for privacy protection next time; at least you are increasing his costs.
You could also engage in a UDRP complaint if dsploit is a trademark; unregistered trademarks are harder to defend however.