Well about " 8 MB Map Size Limit Remover" that works only if everyone has it (So far 500 people, and I doubt the non-maping wc3 players even check hive to discover this tool). Oh and works only on illegal servers (though in case of Garena I was under impression it no longer supported LAN). So yeah not many benefit from unlimited map size and thus size remains factor. And should that really even be an excuse to make 0.5mb unit models?
But more about model? Now i am not modeler but I was under impression that reason why WoW rips aren't allow is because they don't work very well especially if spammed like unit can't be handled by Wc3 engine. So it isn't just because it is from WoW, just see icon section. I can't really see TC, I don't see decay animation and in the end the texture is not that great (really guys what is so great about it?) so why not rip regular WoW model if you really need it. Though in that case you can't upload it in the first place.