EU and US law doesn't work the way they think it does. For starters, FISC isn't relevant law here. But more importantly--simply relocating their servers to Iceland does nothing for them since the company physically remains in Italy.
They (Clipperz) remain subject to Italian laws, meaning that they are still subject to Italian subpoenas and discovery requests. Civil law countries like Italy don't have the same evidentiary protections that the US has. Italian prosecutors can simply use their refusal to provide access to those servers against them in court. (The same is generally true in the US for civil, i.e., tort, cases but not for criminal cases.)
However, since their servers are no longer hosted in the US or the EU, they're no longer protected by US or EU laws! So congratulations, Clipperz! You've accomplished the double whammy of not improving your legal situation at home while simultaneously increasing the threat to your servers! Now the NSA, British Intelligence, and various other US and EU government agencies can legally hack your servers, and the data they recover can legally be used in any US or EU court even without a warrant and despite the illegal means by which the data was obtained. Congratulations!
Here's a suggestion guys: next time, consult a lawyer. You clearly need one.