Here, first of all, OP wants to bring to the attention of the information that, according to the former head of the blockchain department of JP Morgan, banks may soon engage in cryptocurrency business, that is, carry out transactions for the purchase and sale of cryptocurrencies in order to make a profit. It is unlikely that we will see this, especially on a significant scale. This thread was started in June 2018, which is almost four years ago. That is, the "nearest time" can be considered already passed. But we still don’t see banks trading cryptocurrencies and making money on it. Banks can provide intermediary services for the exchange of cryptocurrencies. They are unlikely to trade them, because this activity is fraught with great risk. I think that only some commercial banks can carry out only some of these operations. Cryptocurrency is too volatile in price and unpredictable for the banking system.