Also speaking of world class, have you heard of DJI?
Not trying to move the goalpost, but DJI is more of a hardware company, it isn't really an internet one. Any company that can operate outside of a services model will do just fine in China, since they are just shipping product for export.
Also aren't we talking about tech company? Not internet company alone?
Or do you consider a market closed off if no foreign internet service company is doing well? In that standard US is also closed off because I can't think of a single successful non US internet company here.
But take the typical YC startup business models, most of those aren't going to be in those safe categories.
Also AWS China is a huge deal.