could also just have like some kind of image link auto decrypter/encrypter add-on thing for nsfw stuff on the forums if people want to see it but I'm pretty sure that was tried before and badspot still banned people for posting that stuff.
yeah but it was just rot13 and not real encryption
but honestly more importantly is the fact that you will probably get banned for trying to skirt the rules like that, even if he
couldn't see what the link contained (also if it was widespread enough to be useful you can rest assured someone would actually give him a link)