This is people's first misunderstanding of China's firewall. The government knows they can't fully control the internet, that's not the point. The point is that average person KNOWS the government is monitoring their communications, and that anyone more technically savvy - using a VPN or other circumvention techniques - is generally distinguishable from the rest of the traffic. That's enough to mark you as a person of interest, even if they don't know what you're transmitting. The rest are subdued by a chilling effect.
Secondly, the Great Firewall is extremely effective at what it's intended to do. Have a read through
this technical explanation, or
this article about the how it is changing views of their populace. The Great Firewall has also helped bootstrap local alternatives to international services such as Twitter and Youtube, something our government would no doubt welcome as a means of enforcing new channels for investment and employment while retaining legislative control over.
South Africa signed a co-operative agreement with China in 2015 on internet governance, with an aim of improving our ICT infrastructure through the sharing of technology and techniques. We are beginning to see the fruits of that agreement, couched in convenient trojan horse talking points like "piracy". Weird how many of the most contentious cyber-related bills began to see serious engagement around the same time. Probably just a coincidence.