[yorwba]

Because the Great Firewall operates as a blacklist and is only intended to prevent commoners from learning censored information.

If Zoom meetings where anyone can join became a popular source of unfiltered news, they'd either ban Zoom or require that a two-class system is set up to prevent ordinary Chinese users from using Zoom to communicate internationally, similarly to how Douyin (within China) and Tiktok (everywhere else) are two separate silos.

But people from other countries connecting to servers in China is not something the Great Firewall tries to interfere with.

[devttyeu]

From my experience it's not just a blacklist, any non-blessed traffic is slowed down to a crawl (on the order of double digit kbps). This also applies to getting content from China.

(that said, it's pretty reasonable to assume Zoom is not throttled given how important it is in the buisness world)

[captn3m0]

So who’s making a tunnel on Zoom calls then?

A network interface with WireGuard behind a fake camera interface on a relay node?

[debian3]

Rent a vps on alibaba cloud in China, try to scp a file. Last time I tried it went from slow, to really slow to a complete stop. The file was not even big...

[rayvd]

Did you try on a non-standard port too?