I don't understand which opportunity the try to find in Local Board in this case. If they leave it once they ranked up, why write and spam there in the first place? I got to, that it is easier and more comfortable to become a part of the community through the language which is your native and with people who have common roots with you. But it is not impossible to fill in even without local support at all. For example, I found out the existence of local Ukrainian and Russian communities after quite long time, when I was already familiar with main rules and customs of the forum.
Because locals always tolerate tiny mistakes. Let's say a new user registered today and copy-pasted some random article in our local thread, in the past days, we were used to asking him to edit it and add the source or delete it. Do you see the tolerance here? Global members would go ahead and report their posts and they would get banned without having a single chance.
I disagree with this, at least with what I have seen and been told, but if truly one is banned immediately with a few errors that could be guided and corrected without a warning, then that is cruel. I can't however side with anyone outrightly as I've seen a whole lot of users with powers getting intoxicated, nonetheless, if such issues are raised, I think that such an account could be reopened.
But it is not a wise idea to break the forum rules, after all, the rules are there and everybody is supposed to read them. This is even the norm everywhere and no one has an excuse in this regard. Even at that, reading the rules and breaking them is not acceptable, not in the main and local boards. This is even as some local boards are not as tolerant as you feel if there are standing issues among users. But still, since it is local, more guidance and tolerance are being observed better than in the general sections.