GitCode, a git-hosting website operated Chongqing Open-Source Co-Creation Technology Co Ltd and with technical support from CSDN and Huawei Cloud.
It is being reported that many users’ repository are being cloned and re-hosted on GitCode without explicit authorization.
There is also a thread on Ycombinator (archived link)
It may not be de jure open source, but if the code is posted publicly on the internet in a way that anyone can download and modify it, it sort of becomes de facto open source (or “source available” if you prefer).
Please don’t muddy the water with terms like this. Something is open source if and only if it has an open source license.