Walk up to the counter with a 1099a and be like "here you go bud, it's all there in the strawman account. Later." and then walk out with what you took.
You'd be shocked. There's a "garage sale" down from where I grew up that's been going on since the 80s and is run by one of those folks. He only takes cash (hell, he might take gold too for all I know).
It's literally like a single booth flea market and that guy hasn't had another job in years.
Ask them and they'll say Bankruptcy is itself magic. You say the magic words, sign the magic papers with some nonsense, slap some postage notes somewhere probably, and all the debt just goes away.
We will see this in a federal court case before too long. In the US cash is legal tender for transactions, but plenty of businesses are moving to card-only. This is kinda legal gray area now, but when I still owned businesses it was quite illegal. I consulted my business attorney about going to card-only because of too many hold-up attempts. That was a complete non-starter.
My recollection is that you only are required to take cash for the payment of a debt (so your mortgage company can't demand to be paid in bushels of corn). So theoretically this person could create a business that doesn't take USD but as @some_guy@lemmy.sdf.org said, almost no one carries small bits of gold and silver (or certificates of the same) with them.