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There are people who don't care much about their privacy, so they might decide to expose their bank accounts. If gambling is not banned or restricted in a country, I don't think there is any reason for concern. The source of income of gamblers also plays a role in the choice of currency. If someone earns in fiat currency, it will be a waste of funds to convert it to cryptos before depositing it in a casino. It's just a matter of choice and it's good that BC Game has multiple options for depositing and withdrawal.
I can understand if gambling is legal in your country, then withdrawing from a bank in native currency isn't an issue. But you have to remember crypto gives you freedom. In a fiat system you have to pay tax, though you can show your source of income. But in a big win, you can enjoy your freedom when you are dealing with crypto. Basically we love crypto for financial freedom. However, it's better, of course, when we have multiple choices; we can withdraw whatever we need. But you need to make sure gambling is legal in your jurisdictions so you will not face any issues.