If you are planning to play from mainland China, drop the plan. Due to the unfriendly government policies in China, all online casinos have banned Chinese players. That's a default rule. So even if you manage to play and win, the casino companies may reject your withdrawal request citing policy violation. You can't take any legal step against them.
This isn't entirely true because each and every reputed has their list of countries where people are restricted from registering surprisingly some crypto casinos doesn't have China in it which means they can gamble without any issue but also the user need to make sure that there is no overlap of rule like you are prohibited to register if the jurisdiction have any law against gambling for that they can contact the customer support of respective casino to get clear information about their allowance.
