A small recap is in order. The South Korean government announced on December 15, 2017 that banks as of then are prohibited from participating in Bitcoin trade. And now it comes back in force. Two of Korean major banks – Shinhan Bank and KB Koomin Bank, which offered credit card points to bitcoin swap services, now discontinue this programm.
To better understand what is happening, one has to know, what the credit card point is. Both banks offer the ability to accumulate their bonus points for performing operations inside their respective bank group with their credit cards. And you can use them for purchases in affiliated stores or, until now, to purchase Bitcoin on Coinplug.
All of this stems from recent ban on banks for performing direct cryptocurrency operations. And this doesn't affect only two aforementioned banks. All of them have to cease direct operations in cryptocurrency market, be it trading or setting up shop for a more convenient user interaction with digital currency world. Most major banks even had to stop issuing virtual bank accounts for cryptocurrency exchanges. And the already-in-place regulations prohibit trading without one.
In September government already forced the shut-down of the country's leading creptocurrency exchange Bitnumb in fear that the service could be used by criminals with counterfeit credit cards.