Use Psiphon to bypass firewalls

If you're facing a problem where someone (be it some software blocker or oppressive government) is blocking your access to the Net. You may want to try out Psiphon. According to the website it is

human rights software project developed by the Citizen Lab at the Munk Centre for International Studies that allows citizens in uncensored countries to provide unfettered access to the Net through their home computers to friends and family members who live behind firewalls of states that censor.

It is available free and open source. Is this proof that trying to block access to the Net is actually futile?