Of course I am not surprised at this, because bitcoin is a commodity and whoever buys bitcoin is adding to the market cap. Bitcoin is bitcoin worldwide, but those banks are in various places and their operations is in fiat.

It will be impossible for centralized bank to have higher market cap than Bitcoin because gradually fiat is depreciating and bitcoin value appreciates, which is giving people more confidence to invest in bitcoin and abandon fiat because of lack of confidence in fiat. Banks are run by individuals but bitcoin is decentralized.