Most likely driven by Forum Owner(s) policy to ensure that members don't cause their loss of Manufacturers & Vendor Ad Dollar's and other fees. Copy Right Infringement, notwithstanding.
Note to self: Wonder how many of us, if in the same position, would be willing to jeopardize our income stream, by falling on the sword for someonelse's cause? In all honesty, I can't really say for certain I would!