Hint: it's not a government.
"Applications must not contain any obscene, pornographic, offensive or defamatory content or materials of any kind (text, graphics, images, photographs, etc.), or other content or materials that in Apple’s reasonable judgement may be found objectionable by iPhone or iPod touch users."
Apple banning the Murderdrome comic book does not bode well for Apple possibly handling eBooks in the future.
Future censorship will occur when, in the names of the pretenses of the population, corporations make certain kinds of information unavailable.