Here in India they just return NXDOMAIN for the name. So it is pretty easy to bypass using 8.8.8.8. Also, the guy who installed the router at my home changed the default DNS to 8.8.8.8. I think ISPs do this on purpose. They don't wanna block sites their customers wanna access. And the government is dumb enough to not understand the difference between a DNS block vs a real block.