Specifically, something that allows the following item in the TOS to be removed or eased.
Posting content of any kind that incites discrimination, hate or violence towards one person or a group of people because of their belonging to a race, religion or nation is strictly prohibited.
Inciting 'discrimination, hate or violence' isn't my thing, but clearly it's important to many people who might contribute or increase site activity.
Free speech is an attractive ideal for me and many others - unfortunately following through with it means giving up a lot of website control.
Private subs bring in a whole new wave of admin responsibility. That's not an option at this point. What if someone started a child porn sub as private? Only the admins could see it and bring out down, which is only a few users seeing a few thousand posts some days.