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.
Curious to know why the Indonesian government is so strict about the gambling industry?
This is a huge country in which about 300 million Indonesians live. And yet they live on 18,000 islands. It would be possible to organize special zones for the gambling industry on several islands. And make them legal.
Is it true that Islam forbids doing this? Then the ban is understandable, but still a pity.