Everyone's getting that right now. It doesn't mean your account was suspended, it means the account the domain was registered with has been suspended by the hosting service. To put it simply, the site is down. I sent Dycaite an email asking about it, so I guess we'll see why eventually.
I also assumed I was suspended since I had just made my account yesterday but I had my friends without accounts check if they were "suspended" and it showed the same message so I assumed what kobochat said.
Could it just be because of the copyrighted material? I assume not because of all of the show/movie fan wikis but that's the only reason I could think of for the site as a whole to be suspended from the wiki host.
I guess it depends on the terms of the hosting service. Some are more chill about it than others. Still, though, it should be fine since all the copyrighted material is hosted elsewhere and just embedded here...