It looks like the awesome anonymity of TOR meant that router operators were lax about general security. Well, however it happened, the authorities have hacked their way into the DarkNet and pulled the plug on a number of blackmarket sites, including Silk Road 2.0:
The list of dark markets seized by law enforcement includes Alpaca, Black Market, Blue Sky, Bungee 54, CannabisUK, Cloud Nine, Dedope, Fake Real Plastic, FakeID, Farmer1, Fast Cash!, Flugsvamp, Golden Nugget, Hydra, Pablo Escobar Drugstore, Pandora, Pay Pal Center, Real Cards, Silk Road 2.0, Smokeables, Sol’s Unified USD Counterfeit’s, Super Note Counter, Tor Bazaar, Topix, The Green Machine, The Hidden Market and Zero Squad.
Source: h+ Magazine