How am I breaking the TOS? You granted usage rights over to Giants. You signed away your moral rights. The TOS allows users to use this content, and as long as it isn't for commercial reasons, they are good.
And I'm not just re-uploading your mods. I'm changing your mod so that it is better for many people's game play. Because that's what I care about, is people enjoying the game, and if I can help that a little, I will. I'm not taking credit for anything for the most part, and once the mods are posted elsewhere, no one will even know that put any of this out.