I have understood this well. You are, unfortunately, missing the following: In the discussed context, banks and exchanges are acting according to the requests of government and
de facto on their behalf. Actually, no exchange (well, exceptions may exist and probably exist) really cares where your assets come from, they want to run their business and make money. AML/CTF regulations (inducing i.a.
KYC procedures) are purely governmental tools. Simply said, you are interacting with government via bank.