for all their faults, ordinary banks, in general, do not like dealing with certain types of criminal customers.
there are a lot of checks and balances inside most banks regarding deposit accounts, and transfers between them. some of it is government regulation, some of it is just because banks dont like being ripped off or having their customers ripped off. no bank wants more regulation, but no bank wants to interface its internal systems to some fucking glorified drug-fencing operation. except maybe Wells Fargo.
everything that banks have learned for 500+ years about fraud would be thrown out the window here. it woudl be like the wild west.
if you want to interface your shit-hole experimental quasi-criminal fucktard financial system onto the First City Bank of Nowheresville, Kansas, then you need to just withdraw actual cash, and then give that cash to the bank. Don't try to fuck up grandma's soybean farm with this experimental bullshit.
now you of course want to say, look at all the de-regulation that caused the crash of 2008? well, none of that was really about bitcoin or ordinary banking activity, like deposit accounts. that 'normal banking' is still the fundamental piece of the banking system that has to act like a Water Utility in a modern society, allowing money to flow freely with a relatively stable value.