The only explanation I can offer is that "this" kind of material, "our" kind of material is still highly "questionable" in this arena, and all it takes is one zealot who thinks such material violates codes of conduct or breaches the vague limits of legality (always very speculative and open to interpretation)... That or someone from the originl copyright holding manufacturer has manages to supply info about something relating to unlawful use of copyrighted material. It's always very open and at the mercy of these online activists. I myself often mention on my own blog (not this site here) how I surely must be the most censored person on the internet due to my content regularly being put down / taken offline by others.