summary
I have started an instance on Google cloud platform (Compute Engine) half a year ago and now my employer wants to know if a Chinese collaborator can use the service I put on it from China. How can I know without testing if the great firewall of China will block my service or if I have to switch for an other platform ?
For information I don't use Google DNS, I make a redirection from my registrar to the static IP of my server.
There is no restriction from Google side :
Google Cloud Platform do not have restriction on the traffic coming from China. If you are hosting website on GCE, traffic coming from the China users will not be blocked. That being said, Google do not have any control over the GFW blocking methods.
If you don't want to test the service with tools like WebSitePuls or vpnMentor, you can start a separate service just for your customers in China: