Well, Chinese platforms often do not advertise themselves in other places apart from their target audience (Chinese). It makes much more sense since they only need to focus their attention on on market and be able to customize their service on one specific demographic.
~snip~
^ This reason has made sense to me and it is definitely right.
If a gambling casino platform is pure Chinese language use it will probably be that they are focused on their local not on the international but if they will use an international language which is English. It is sure that they not only focus on their local at the same time in other countries too.
However, regarding the KYC which is a case-to-case basis which is we need to investigate why there is no KYC.