Earlier quoted context omitted.
How would Coinbase know anything about your transactions? Shouldn't they just process the exchange of necessary payment information?
Well if you conduct transactions on their platform, then they know the source/destination, notes, amount etc. AML laws require them to detect and prevent illegal activity on their platform (just the same as Square, Stripe, Venmo/PayPal, your bank etc).
Is there a comprehensive list of banned destinations?