If Google establishes that the venue they're suing in has jurisdiction (which seems pretty clearly established, since it's where a substantial amount of the damage has happened), then the judge is going to let the case proceed. If at that point the defendants don't bother to show up and don't respond to subpoenas Google will eventually win a default judgement. If the defendants don't comply with the default judgement (why would they?) the judge might hold them in contempt, and then they won't be able to travel internationally to anywhere willing to extradite them or keep assets anywhere that will seize them on behalf of the US government, which is most of the world.