Not sure how accurate this website is, but it seems to be blocked currently.

http://www.chinafirewalltest.com/?siteurl=https%3A%2F%2Fgith...

. .

There is a long history of why it's blocked. Some repos were hosting essential code to bypass the Great Firewall. Others were spreading tools to advocates of Free Tibet and Uyghurs. And, there are some software devs who were promoting and supporting workers rights/strikes in the context of 996 scandal.

GitHub wasn't freely accessible or access to its services were disturbed during my college years ('12-'16). Any information platform that evades the PRC control system gets blocked once it achieves major attention and onboards influential users.

That's my mistake, I should have included a source. But the fact remains, it is blocked: http://www.chinafirewalltest.com/?siteurl=github.com.