This has been covered before in several posts. We ask users not to do that (despite the fact that they do so at their own risk). Doing so prevents commercialization of the powerful ideas it portrays. Despite it being decentralized it is somewhat self-moderated. There is a mod key which is shared among dedicated noble users, anyone can use that key. It's not censored per se (no more than one could censor Bitcoin or uTorrent) but it's more of a fail safe because we can't anticipate the future or what will be requested of whoever is coding this at whatever given moment. If something is on the markets that shouldn't be there is brought to the attention of the community it would probably get removed although it's a volunteer system and the team or investors shouldn't be expected to be responsible because indeed it is peer to peer (how can anyone possible moderate the entire internet). So yeah in our disclaimer, we tell people it's simply a protocol that is peer to peer, we don't encourage anything that would get anyone hurt and hope to see the concepts of decentralization become popularized. Just like on uTorrent, if you share an illegal torrent it's the person sharing that gets in trouble not the programmers since they don't endorse that, they simply make peer to peer software. Also Bitmessage requires a little bit of proof of work, so spamming it is not easy.