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)
I feel like the effort to make such a repo and make it popular enough to be cloned and rehosted is a lot more effort than someone manually checking the results of an automated filter process.
The “effort economy” is hugely in favor of the mirroring side