Square run its forums in the most stupid way possible, they force game masters to moderate the forums. This means they force them to have more things to deal with when they are already busy dealing with in-game calls.
As such they will look for reasons to ban you to lower their work load, less people posting = less work. I've been banned from the forum 5 times on multiple accounts, the last one for saying "The developers don't care about what English speaking players want", permanently banned for that.
That's not true, you're completely drunk here.
GMs are seen as "moderators", meaning they moderate both the in-game but also forum community, they're one and the same on SE's scale.
You can't ban people to "reduce work load", first because the activity is abysmally low so they hold their horses a minimum, despite forums having no in-game impact.
Second because there are specific rules to follow, preventing a lot of "I'll ban this dude, *** it". You'd get into troubles and it's not worth losing your job for any FFXI player, no matter how badly paid it is, period.
So yeah, if you get banned on the spot on the forums, you have either to have been dealt with by a notorious moron or you went full retard. There is no other choice, unfortunately, but it's not so difficult to know which one it is.
And well, if you have been banned FIVE TIMES, to me it sends a clear message about you more than about them: stop *** posting.
I have no idea why anyone would post on forums, anyway. It's specifically designed for discussion not happening.