^ 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
More like, focusing in chinese people who resides outside china and the business is based outside china too. Coz if the platform is accepting crypto then they are subject to be seized by their government knowing china hate crypto. So focusing only to their locals and operating in the country doesn't make any sense.
Also, probably the team behind only knows chinese language making more sense.