An uncorrupted 'government' would revoke those banks' charters.
Since the banking and currency systems are a monopoly in the US, and the payment processors unable to operate without .gov permission, the wokisms, "start your own!" and "MuH pRiVaTe CoMpAnY" don't apply.
"Bake the Cake, bigot" does.
Every "Dilbert's Boss" in municipal utility management fell for the "benefits of automation" hype without giving a single thought about what they were throwing away.
The same has applied to telecom and electric power infrastructure. These 19th-Century technologies were some of the most resiliant, in the past. Enemies had to go places and risk their lives to do things in order to inflict damage.
But now, some script-kiddy in Moldova can bring this country to its knees from his mother's basement, and the people who made it that way deserve a wood-chipper ride.
#17: "...would have left a mountain of evidence"
That's always been the tripping point for me. The most "alles in ordung" society on Earth should have had world-class record keeping to support a literal industrial-scale undertaking.
So; where are the records?
The whole "Coin Scene®" was always a honey-trap.
For all the blather about "non-governmental, private, de-centralized", etc., 'Crypto™' is un-workable without the government-monopoly internet.
Go ahead, hype-masters: Tell us how you're going to implement "distributed ledgers" without government permission.
You'll be reduced to 'moving' your "blockchain" between BarterTowns on USB-sticks and SD-cards.
They still can't leak a data element or payment-methods you never put into it.