If you really want to know the whole thing, that thread was were a lot of the general blitz against them came from with a lot of mod makers and figures in the Arma modding community understandably speaking out. If you mean in general: bundling others mods inside their own without asking for permissions (and in some cases like CSE using it when permission was denied) while asking for donations, using other peoples content without crediting them, converting and using content from other games like Forza, charging for people for access under the guise of donations, etc.
