Thanks for the question. There are a lot of different types of Rootsweb sites and I don't think I have a definitive answer for all the different types of sites and areas.
The general idea is that when people own a website and publish information, they control that information and can opt out at any time. From my understanding, that does apply to sites that are controlled and put up by societies and only hosted by Rootsweb/Ancestry.
I am going to dig into this to get a better handle on the different types of pages and information on Rootsweb and see if I can get a better definition.
If you have specific examples, or if there is an area where you are the administrator, please send me those examples and I can give you a better answer.