This is mainly because Chinese online payment infrastructure didn't have good support for subscriptions or auto payments (at least until relatively recently) so this pattern is the norm
It's more of a culture thing. People just hate the concept of "idk how much I'm going to pay let's just try this and find out later".
Also people would be confused as they expect things to be prepaid, so if you let them use the service they'd think it's a free trial or something, unless you literally put very big, clear price tag and require like triple confirmation. If not and you ask them to pay later they would perceive this as unfair deceptive tricks, and may scam you by report the loss of their credit card (!), because apparently disputing transactions in China is super hard.
OpenGFW is your very own DIY Great Firewall of China (https://en.wikipedia.org/wiki/Great_Firewall), available as a flexible, easy-to-use open source program on Linux. Why let the powers that be have all the fun? It's time to give power to the people and democratize censorship. Bring the thrill of cyber-sovereignty right into your home router and start filtering like a pro - you too can play Big Brother.
How is this going to work when a lot of sites/apps start to use QUIC? It's like blocking HTTPS because "the limitations upon network management are massive"
It's going to make things work slightly less well from the corporate office than they do at home on your cheap setup.
That's a continuing trend, and you might recognise it from other aspects of life. Paying more while deliberately choosing a worse service is pretty much life-as-usual for corporations.
One of my previous employers had a deal to get train tickets. In my country train tickets for actual consumers, even ordered online, don't have a service fee. After all in choosing to order online you're actually saving them money, why would it cost extra? But the corporation paid about 5% fees to get train tickets from a company which also provides those zero fee services to individuals.
Or think about all the companies where Windows XP desktops were still being used years after they were obviously the wrong choice.
Monday to Friday the world IPv6 utilisation goes down, but every weekend it's back up. Because at home people have IPv6 (even if they've never thought about it) while at work somebody explicitly turned that off.
One of the nice things about working from home is that my network works very well, whereas whether I worked for a startup or a billion dollar corporation it was always one problem or another when I was in the office. Which reminds me, I should really look for a new job as this pandemic begins to slacken off.
Many sites will support QUIC soon, but they won't strictly require it for a long time, it's negotiated and backward compatibility isn't irrelevant quite yet.
They will always have to support a fallback (HTTP/1.1 or HTTP/2), because not all users are guaranteed to have success with QUIC. Blocked UDP traffic and ports can be some reasons why it won't work, too small supported MTUs can be other reasons.
I would've bet money if Pakistan starts building a GFW, it would be with china's help but no, they bought equipment for this from an american company called Sandvine.
This is mainly because Chinese online payment infrastructure didn't have good support for subscriptions or auto payments (at least until relatively recently) so this pattern is the norm