Kinda, China has the GFW so you need to circument that to access a larger part of global internet. Though that is relatively "easy" than to get a proper working SMS or KYC for Anthropic or OAI.
You can check for yourself here to see that China and Hong Kong are conveniently missing. We do see blocking from Anthropic and Gemini as well in some regions
Also even though Vietnam and the Philippines are technically supported we do see blocking from some IP addresses in those regions too