The largest target in our entire industry is GW, as most of their infrastructure is based outside the US. Since their products draw so much inspiration from popular culture and fantasy tropes, they could conceivably come under attack from all sides very quickly indeed. They are simply a big fish in a very small pond, SOPA/PIPA would crush GW's online presence with the MPAA sharks swimming about. The only reason why movie studios and music labels are for this is because they have a tacit agreement not to attack each other, much like how having a very large patent portfolio is both defensive as well as offensive (any attack will be mutually destructive).
For example, with Egypt's ludicrous attempt to copyright the Pyramids, under the reciprocal Berne convention of which the USA is a signatory, the Egyptian government would then be able to establish a "good faith" belief that the Necron Monolith breaches their alleged copyright on the Pyramids, that images of Monoliths also infringe these copyrights, that sale of Monoliths are counterfeit, and with a very low bar of procedure or evidence, have GW's site shutdown and/or delisted, and have Visa stop doing business with GW. Of course, GW would be free to fight this and have their site and business relationships re-established weeks later, but frankly why would Visa want to work with GW again? It wouldn't be worth the hassle. And since Egypt had a "good faith" belief of infringement (even though it was stupid and wrong), they could cause all this damage to GW without recourse or compensation to GW. This is obviously insane, and yet one possible way to interpret this very broadly worded legislation.