What he is doing with the lawsuit, is trying to prove that he ONLY sold the account, but didn’t cheat on it. If this works it means that he will face punishment for breaking the TOS of Valve, but I don’t see how breaking the TOS gets you permanently banned from majors
Until Valve hits Finnish consumer legistlation and concept of child (under 15yo) and what you can actually contract childs with. You can't overrun that with lawyers. I'd say Valve will be in big problems in Finland (at least), if this gets forward.