Then there are the corporate-backed efforts from Bytedance, Tencent, Alibaba, Baidu, Huawei which are sometimes published here and make the news, several frameworks and engines.
Some projects only have a read-only mirror on Github, because all the work is done on their local alternatives like Gitee, or scattered around other places.
And well, anywhere you go a lot of software is disposable; integrations, widgets, things tailored to the local market, and so on... so that's probably why we don't see as much. I mean, it pales in comparison to the amount of culturally impactful software made back in the 80s and 90s, both in Europe and the US. But all things considered, I think they are catching up, and the traditional language barrier is breaking down, as in, I'm seeing more collaboration out in the open.