That is retard. Unfortunately I don't remember my law courses, but I'm pretty sure they have to have some real reason to sue him in Australia.
From what I understood, Evony servers are based in the US, the company that runs it is a branch of a chinese company, and is located in the US as well. The whole Australian thingy has no ground I'd say.

You can't just fill a paper, send it to a lawer office in a far away country and have them sue someone on another continent. There are some very strict laws as to what country is competent in what case. An australian court has absolutely no legitimacy to have a say in the matter.