Why We Haven't Seen Any Lawsuits Filed Over Domain Seizures?

<snip> What was really incredible was how everyone I spoke to involved in these cases (even though not at all connected with one another) had an identical story: they'd all love to take their cases to court, but they're waiting for the government to actually get in touch with them. </snip>

Please read the article.

I'm not sure if this is sufficient. It seems that most of the seized domains have been registered with US-based registrars, but some of them have been registered with foreign registrars.

So either those foreign registrars complied to US government requests although they did not need to, or the US is blocking those domains directly at the registry level, independent of the registrar used to register them.

If the second option is the case I wonder why they have only targeted relatively small sites so far, instead of larger sites such as Piratebay and Demonoid.

Arguably, civil rights would also be a winner of such a lawsuit. This doesn't mean that it's suddenly profitable for these sites to enter a long court battle, of course...