Having geofencing in their routing algorithms is state of the art, and probably more advanced than most other services.
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.
(that said, it's pretty reasonable to assume Zoom is not throttled given how important it is in the buisness world)
