They can also issue their own cell phone network, imitating Verizon!
They can also issue their own internet protocols, imitating HTTP!
They can also issue their own pizza, imitating Pizza Hut!
They can also issue their own movies, imitating Netflix!
I'll give you some time to figure out why no bank has ever done any of the above successfully.
Okay, I can see your stumped. The reasons is: They don't need to. Banks don't need to innovate! They're made of money!
Not only do they get to print money from thin air with the magic of fractional reserve banking, they can also gamble with national economies AND LOSE, because they're "too big to fail"!
When you own the government, you can just sit on your fat pile of money, shitting ever more money, and never do a damn thing for society.
Banksters are parasites. Central banks are government-endorsed ponzi schemes. Get it?