Yeah I can totally see you have the ability to stretch 3 sentences to a book.
That rule exists. And the bans are not just because of CP, the banned sites also include stolen content, commercial stolen content and animal abuse. The CP portion is usually small or just in the form of adverts and not actual content.
We do not want to give platform to sites that do fuck all about animal abuse and serve it to people.
That would be nice, but it is completely in the realm of fiction considering that this is a small forum containing a tiny fraction of their visitors.
Some explanations are in the rules.