Well, the reason I ask this is that even you all know "Binomo" is illegal in Indonesia but they deposit QRIS system using payment gateway service. It's not someone bank name, and has a good scanning process transaction comparing the current one in BK8.
Never tried binomo before so I cant give any comment related to the payment method. Coming up to the legality, binomo and bk8 are different platform so I think the rules is also different. Binomo was known as trading platfrom (before the huge news some time ago), while BK8 is a gambling platform so we cant compared both especially if it is related to local payment gateway service as it wont be possible to have an official gambling company in Indonesia.