They picked anything that was remotely manga and had audience on Tapastic. This site is clearly just trying to steal things that people might be susceptible to pay for, no matter it's porn or not.
As for the location, someone mentioned Indonesia or something, but seeing how it looks, it might be anything like China or whatever. In this case, they won't give more damn about pretenduous lawsuits than they gave about stealing your comics. We're not talking about civilized persons here, we're talking about thiefs with no consistency in their own content.
This kind of persons.
The only hope to fix this would really be to stress the servers enough to take down the site, or find a hacker who can f*uck it all up. Sorry for all those who've been infringed.