Never seize but that's not the true problem, is it? Anonymity is the actual problem.
Why aren't there any of these guys trying to build this sort of thing on-top of https://gnunet.org/ ?
Why aren't there any of these guys trying to build this sort of thing on-top of https://gnunet.org/ ?
Could you make a market like this anonymous in the same fashion? Even if the Feds seized one node they'd have only seized one node?
GNUnet can be used to build a darknet of any sort: P2P chat, a social networking application, email, you name it. Brilliant people are plugging away at it to build a platform for people with less knowledge of cryptography (like me) to build this sort of stuff on top of.
They do have a P2P chat program built on-top of it so you can use that as an example and I think someone did their thesis on building a "facebook for GNUnet" on an older version. Not sure if that code is public though (it most likely is, I just don't know where).