Even more amusing is that the coins that the exchange returned to me had a 1% risk score. In a way, they 'cleaned' my coins even though they refused to process the swap order. 
Well, that's the best case scenario that I have heard of. Where did you make the "risk score" check to see that 1%? Or do they tell it to you? From what I heard, they guide you to check it through the checker provider that they use.
Who determines this "risk score"? I'd say this just confirms the "risk score" is mostly arbitrary.
The whole situation is arbitrary from the start. We know that they want to know and control everything. Since every exchanger uses another AML "risk checker" service, we can say that any of them can black listed whatever address it "sees" fit. However, if they cooperate between them and share their info regarding "black address", then we will face the same issue in any exchanger. It seems that we are not far away from this becoming a regularity.😟