[belorn]

It seems that a lot of such blocking are done with a lower kind of effort by those who are tasked to implement it. An example is the UK porn and piracy filters,but also a bunch of east state countries with the "whoops, you entered a bad place" firewalls.

I would speculate that the purpose of those are not to be a perfect blocks but rather a methods to mold and redirect citizens towards what the state want.