It's a cheap example, banks might have been better what with the obviously costly AML/KYC and bookkeeping requirements (not that these are bad, merely that they tend to centralize and concentrate actors so the fixed costs can be amortized more efficiently over a greater number of clients).
Airframe certification is so costly that nobody's making new ones would be the counterargument re Boeing, but like I said they're a cheap example.
More broadly, "regulatory capture" is another driver of the centralizing black hole at the heart of the USG.
