I was (am?) a moderator for Technic/Tekkit, and at the time the modding community seemed to me like it was a cesspit of adfly links and people eager to claim copyright over everything they touched. If the community is still similar then I agree, seeing the reactions to this news will be interesting to say the least.
I still don't grasp why everyone is trying to make a profit and claim copyright of their modification on someone elses work. (That doesn't have a licence to allow modification)
Because at the end of the day your code is your code, and you do have copyright on it, and in a number of cases are or should be legally allowed to profit off of it.
Especially when you bought it under a license [1] that allows you to do so
