Actually, I don't think github is proper place to discuss workers rights. First if China gov block Github eventually, The whole programmer in china would lose a good place to share, learning knowledge.
Second, In China, programmers are looked as mid-class, what most of them earn are as ten times as what other persons who work at other area earn. we can't because they speak loudly, then think they are right. they 996 just because they earn much more.