Every time someone says "banking is highly regulated", a banking executive does not go to prison for breaking a banking regulation in a way that has quietly cost consumers hundreds of thousands of dollars in aggregate.
I have no interest in protecting banks from businesses that act just like banks, and then get punished for doing those things, only because they are not legally considered banks. The last time banks pushed the limits, failed, and caused damage to the entire economic system, it was 2007-2009, and no one was ever held individually responsible for it. I haven't forgotten or forgiven.
So yes, please. Hurt banks. Protecting them just turns them into privileged asses. The "tight regulations" function mainly as their cartel membership rules.
Split tally sticks worked as privately-issued financial instruments for centuries, before banking lobbied to have them outlawed. Banking works better (for the banker) when there are no lawful alternatives to the bank's notes. A cryptographic equivalent to a split tally stick is very acceptable from a historic perspective.