The government controls the banks in much the same way they’re attempting to control Coinbase. You don’t ask the SEC what’s legal, you’re supposed to hire lawye

The government controls the banks in much the same way they’re attempting to control Coinbase. You don’t ask the SEC what’s legal, you’re supposed to hire lawyers that are good at predicting what government regulators will approve of and do what they say. If a bank does something that regulators don’t much like then they’ll shut it down rather than trying to save it. (As happened with the crypto-friendly banks.)