On the plus side the internet is designed to be quite hard to block at the borders and you can still access most stuff most places with a little effort. Governments have been trying for years to block stuff and had limited results.
I think most haven't put in the effort yet, but it is rather possible to make it extremely inconvenient where even if you get around the blocks, the experience will be extremely slow, random disconnects, non existent upload bandwidth so you could consume but not publish much etc.
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Conceptually, it represents the same as any other illegalization:
1. A government has authority for a geographical "box".
2. The government succeeds if it can plug all the "holes".
3. Rogue anti-government behavior punches new holes all the time, which is an endless battle.
In the case of the internetwork, we're two underwater cable cuts away from severing the planet asunder and effectively patching most of the "holes", but that would also destroy most of the economy, so no government really wants to do it.
I guess my political statement/point is that as long as there's too much to track, we're all safe, so making more things across more domains makes everyone safer.