I have been involved with the community for many years... and therefore I do not completely agree with your statement: "there are not enough open source projects and contributors in China". We have them, and they generally contribute directly to the projects involved (as it should be as you do not want to create islands/insular projects). Local (and localized) initiatives are great and I hope this is what you meant.
The open sources community in China is still small and lack solid industry support. We should build a bigger community and let more people have the ability and will to contribute.
That might be an excellent way to demonstrate the power of FOSS to a small but growing community in China...
Side note: I have been closely involved in the Chinese Fedora community; assisting and streamlining procedures within the community and getting the community members closer aligned with the project and project goals. As a project we actually haven't treated Asia or China any different from other regions, such as South America, Europe, etc.
However, it is still different, sometimes very different in details and implementation. And the difference needs time and efforts to eliminate.
The code hosting service under discussion is based on Gitlab, developed and operated by CSDN staff. Tencent became a sponsor this year.
And because there are not enough open source projects and contributors in China, we are instead building user community around open source projects at first. It will be a little different with Github way.