But they aren't violating GFDL 1.3, since they aren't using it, so what was you complaint about?
My complaint was that the WMF was (and still is) copying and distributing my copyrighted content in a manner other than that expressly provided under any license I have granted them.
Sure, but the license they're using doesn't recognise complaints so your complaint can only really be considered to be an informal request for them to change what they're doing. If you want to take any formal action you'll need to file a lawsuit (please don't! The fact that you're here suggests you did, at some point, support what we're doing here, please don't ruin it!).