Offer Bitcoin storage (vault) with insurance. Invest in Bitcoin startups. Bitcoin loanss. Tons of other applications that aren't possible with fiat. Plenty of opportunities.

In fact, for them it's the same as for anybody else. With cryptocurrency, banks no longer have a privileged elite position, they're essentially just companies with the same possibilities and limitations as any other company or person. So if others can earn with Bitcoin, so can banks. Sounds fair to me!