> It's by the people at Dangerous Prototypes
Source? I can't find any mention on their website.
My source is the Hackaday post at http://hackaday.com/2014/04/08/dirt-cheap-dirty-boards-offer..., which says:
[Ian] at Dangerous Prototypes has just announced Dirt Cheap Dirty Boards, a PCB fabrication service for times where quality doesn’t matter too much.
There's "© 2014 Where Labs, LLC" at the bottom of dirtypcbs.com page.
They're explicitly saying the quality is not top-notch, but compensating with the price level to target prototype runs.
With only two pricing tiers (5x5 cm for $12, 10x10 cm for $24, both include 10 copies of the board and global shipping) it's really simple and very cheap.
It's by the people at Dangerous Prototypes (http://dirtypcbs.com/) so I'm pretty confident they have plenty of experience in dealing with pcb manufacturing houses.