My theory is that the moderators modified the introduction forum so that only members of CoS could read and reply to the newcomers...
I HOPE that I am wrong!
That was my theory as well, but assuming that the permissions on this forum work the same as many others, if only CoS members were permitted to view it then the new members wouldn't be able to get into it either. The only way they could do that is if other groups were created, making everyone who already exists a member of a group that doesn't have permission to access that forum, while new members do, and then manually moving every new member out of that group and into the one with everyone else.
That seems like a lot of extra work for the mods.
But then it keeps down the eye-gouging and civilian policing and everything else that happens in those, so perhaps the extra effort is worth it.
If that's what's happening.