Most of those I've seen use the revenue used by the defendant as the example of damages, though, right? When I went through Microsoft copyright bootcamp this was like premise one. So folks like Technic and FTB who may collect money directly for their work (e.g., offsetting hosting costs and promotion is something I know both have asked for) are probably more subject to this.
The Plus+ page said that the modder had to get revenue from their mod to have a valid case - not the modpack.
If they were right, then you could get away with putting free mods into any modpack you want, even if the modpack makes money.
Can you sue someone for compensation for emotional damage? Some modders do care that much about their mods.
You don't need to do anything special to have copyright of your code. I think Plus+'s point is that civil suits are non-starters without damages which sort of end-runs around it? Their idea that mods are purely derivative work is something that absolutely should be declared by Mojang though, because only a court case could draw that line definitively in absence of licensing.
That was their first point. Their second point was that mods don't have copyright, which is wrong.
The other problem you've got is that it's both a pro and con to get included in a modpack. If that modpack blows up the way–say, Big Dig has? Well then that's great publicity for you and it's likely you can use secondary channels to get more revenue from your work. On the other hand, there is always the chance that that people will improperly claim your work or poorly handle the situation. I don't envy you in that dilemma.
Me personally? All my mods are MIT licensed, except for Advanced Repulsion Systems which is LGPL because that was Thunderdark's choice.
But let me make it clear: you are definitely on the list of people that I would donate to if given the opportunity. I just suspect that's complicated without raising Mojang's somewhat justifiable ire. I wish TechnicLauncher had a button and a way for you to say, "I'll accept donations to the cause of my awesomeness" or "I'll accept donations to the following charity" and then we could probably offset some of your/other modmaker's adf.ly revenue, which I cannot imagine is very big.
Technic has donation links here. I'm not there because I'm not accepting donations, which is my choice not Mojang's. I don't use adf.ly either.
Is this thread even about GregTech any more? Lol...