Somehow I knew when I wrote that comment that someone would interpret "it's possible to discourage VPN usage and make it harder for the layman" as "it's possible to prevent VPN usage completely and China is 100% successful at doing that". China hasn't gone all in on blocking VPN traffic either way, since corporations can still use them and tourists don't like having their internet connection dropped without warning (which they actually did at one point), but someday they might and it will probably be enough to prevent the majority from using VPNs to circumvent government censorship.