Because of the ICP license, since golang#org is a website and belongs to google, while google deoesn’t has an entity in China, so there is no way to get ICP license from MIIT.
Here is an example, look at the bottom of any webpage in China, you will see “京公安备案1000000号”, which means after you got the ICP NUMBER, you can legally publish information on your website under some conditions. If the web master decide to put some illegal information, then MIIT will find the entity and deal with the regulations. If someone report to MIIT that there is an online website doesn’t present the ICP NUMBER in the page, usually, the website will be blocked. And the cloud providers have already cooperated with MIIT, so http port 80 on your VPS will be monitored in any second.