Did she actually do anything cute and funny or was she just banned because "loli"?
I didn't see the stream but I think I gleaned from other's comments that she said something about killing herself as a joke and Twitch gave her the axe for it. This is just the observation of one very tired person with no context beyond this thread.
Considering some game companies get up their ass about mods to their precious products, especially JP game companies, most likely need permission from the game company as well as all involved modders.
Death to game developers.