It will be much harder to close them down now (it is as if they are Learning the same questions as bittorrent and wikileaks have learnt)
"Silk Road 2.0. This defiant clone of the original claimed that its source code was backed up to 500 locations in 17 countries, so if authorities shut it down, administrators can rebuild in 15 minutes flat. “If Silk Road was taken down we could have it up and running again within 15 minutes,” wrote the new DPR. “Hydra effect on a massive scale.”
A Virginia coder named Brian Hoffman created this open source project to be a fully peer-to-peer uncensorable marketplace: named OPENBAZAAR Product listings are hosted on the computers of anonymous users, and freelance arbiters settle disputes for a fee. Hoffman says he’s not inviting in drug dealers, but that he can’t stop them from crashing the party. And with potentially thousands of different computers hosting the network and no central target for the Feds, it could be nearly impossible to shut them down.
And the payment and authentification infrastructure has also been ugpraded as explained in this article
"Evolution, by contrast, has used clever security measures designed to prevent that sort of heist. Like the Silk Road, Evolution accepts only bitcoins and runs on the anonymity software Tor to prevent its users or itself from being tracked by law enforcement. But it also implements a bitcoin feature called “multi-signature transactions.” When users make a purchase on Evolution, they can place their bitcoins in an escrow account created by the site. Control of that account is shared by the site’s administrators, the buyer, and the seller; two out of three of those parties must sign off on the deal before the coins can be moved again. That makes it far more difficult for buyers and sellers to scam each another, and prevents coins from being stolen by the site’s operators or seized by law enforcement.
In another innovative security trick, the site also offers its own version of two-factor authentication: When the feature is switched on, anyone logging in is required to decrypt a message with the private PGP key kept on their hard drive.
and theguys from Evolution are not doing it for free, they ask 4% of every transaction but hey even for criminals protection and anonimity can't be free
with that they are rumoured to also be funding other crimebusinesses like identitytheft another very lucrative market