I checked your link and saw that the union bank along with the partnership with Swiss Technology started adopting bitcoin and Ethereum. But they mention that this service is limited to the philippine. If we think about what should force the banks to support Bitcoin then I found that both the bank and Bitcoin are the opposite of each other, bitcoin is decentralized while banks are central with one authority. the only reason for Bitcoin is for their own interest. They know the world is going to adopt Bitcoin and it will be beneficial so they started this through they also take most of the benefits from it.

But I am confused maybe it is valid or not if banks hold bitcoin, will it affect the decentralized nature of bitcoin or not banks are centralized and when they hold bitcoin they have some control over it this is my thought and I don't know is ture or not.