I don't think our actions on the forum would warrant a game ban unless we were discussing doing things that broke the rules in-game. Hurling insults at each other on the boards is a very minor issue, so that's why I think ban evasion isn't the highest concern. It's more of a deterrent for those who would continue to do it without being banned and a lesson for those who wish to come back.
The best thing I can suggest is if you know of someone who has evaded a ban that you do not like, just block them. To be fair too, the majority of those I've seen banned are people that got in heated arguments on in-game suggestions threads, which is still a relatively minor thing. We're not talking about users issuing death threats or sending viruses or spamming shocking images and videos or anything of that nature.