The other side of this is the US Government imposes strict requirements around KYC and AML/CTF. Banks have effectively been deputised by the US government to en

The other side of this is the US Government imposes strict requirements around KYC and AML/CTF. Banks have effectively been deputised by the US government to enforce and regulate payments. A bank can't merely process any transaction that comes its way. You need to know who the parties are, you need to check they aren't on a prohibited list, or in a prohibited country/region. You need to know the purpose of the transaction (to pick up money laundering, or drug/terrorism financing).