This is, yet again, an attempt to write down a policy that's been in effect for quite a while.
All comments go to moderation. I will get around to checking the moderation queue - honestly. (OK, not all comments - administrators and certain "blessed" accounts - of which there are none - also get to skip the moderation queue.)
All comments are subject to a "lameness filter" that will reject comments based on programmatic filters. These are basically an attempt to block spam without requiring a captcha.
This policy has been in effect for a while but never officially typed up. Basically, user accounts used for spamming will be deleted, and any account that has never been accessed after six months will be deleted.