That depends on the focus of the fan site I guess? I feel like extremely big communities are handled rather strictly in comparison to smaller ones but if it's a news and offcial content oriented site, I guess that fanwork wouldn't be too appreciated.
A huge part of it is that most people who run these fan sites do so on their own time and their own dime. So only the really passionate people are running sites, and that can manifest itself in different ways.
Meh. I just feel like I'm more restricted on WtW than on here. It doesn't feel as fan-focused as I personally would like it. Not that they should cater to me. It's just a little tightening on how they act.