I haven't a clue.
But one thing that I can tell you is that each board is moderated as a stand alone entity, and it is up to the mods and the posters of that board to decide on what does and does not "go" on their board.
We have the DIS Posting Guidelines to use as a starting off point. But from there, it will depend on the individual boards.
What is permitted here on the CB may not be permitted on the Budget Board. For example, in recent weeks, there have been a number of threads started on the Budget Board regarding eBay auctions for GACs and fast passes. We have not permitted these threads to go on on the Budget Board since the eBayer in question was not a member and could not defend or explain themselves. AND the threads were becoming debates over whether these auctions should or should not be reported, whether the eBayer was a cheat or an entrepreneur, and so on. While we do not permit threads that ultimately become debates on the Budget Board, it may be perfectly acceptable on the CB or other boards. That is one reason why you may see threads on one board closed even though you know that it would have been acceptable on another board.
I hope that this clears things up a bit for some of you...