Well the difference is that the text is not illegal in those contexts. False advertising is. Fraud is. Threatening people is. But just simply having a leaflet with false advert printed on it isn't. It's not a crime to have it. With CP just possession is illegal, but I really don't believe that a written book would be illegal in itself? I can't find any examples of someone being sentenced for writing a book, outside of regimes where the book was critiquing the party etc.....