Yes but sites like Piratebay don't host cp and would remove that sort of stuff. Most people really aren't going to be wanting to use this to sell their goods when their listings are ranked alongside weapons and extreme porn. I think this sort of software should be used by each individual market not a free for all ie have a one on the clearnet for ebay type stuff, then one on the deepnet for drugs and then there will be others that have the more sinister stuff (not that I would endorse them but I think drugs should be kept off regular users wanting to sell their own legal wares etc).