as far I know only Indonesia Bank, maybe if many people from specific countries have joined, does not rule out the possibility of adding more Bank from other countries. so it could bring more players from other countries.
As far as I remember there are also option to deposit with Malaysian local bank as well as the other local banks as long as the country is listed such as Vietnam and Singapore. BK8 is focused in Asian countries especially South East Asian, so the availability to deposit with local bank is not only for Indonesian players. In other words, once a player created an account and choose a specific fiat money as the main balance (except usd), then there will be a way to deposit with the local bank account as per selected fiat currency.
You are right, users can choose the currency according to their country in the asia region Thailand, Malaysia, Vietnam, Cambodia and singapore of course Indonesia. when the user has chosen their own currency, BK8 will provide a deposit account according to their respective local banks, while for countries outside Asia can use Dollar or Crypto as an alternative so actually the available countries are unlimited except countries which are prohibited under the rules & conditions.