Can you compare comics to games? I sure we'd all say yeah but having dealt with paranoid copyright peeps before I could see where they'd make a case against the comic. The comic lacks a varied degree of "what's happening there", the intent of the graphic is clear, dude shot in the back of the head. Its consistent every time you look at it, head shoot. A game is varied content, sometimes you see something offense, sometimes not, that degree of randomness saves the game from the harsh eyes of scrunity, the comic can't escape.
The other thing that could be the factor is the international flavor of graphic material. I recall doing packaging for an animation company and the USA cover image of a gun pointing out at the view, aka the james bond like effect was cool and ok in the states but banned in UK! Thats insane but the BBC demanded their own version of the cover with the gun pointed to the side and not straight at a person picking up the video tape. Likewise content in a film is also subject to weird rules, BBC approves sleeping with your mother but whatever you do dont show anyone getting whipped on camera that dooms your film to XXX land.
Theres a chance that comics may suffer the same WTF reasoning on the iphone due to international exposure. Who knows.