Call it whatever you want, but until you show me that paying for my ticket in Kroner violated a law, regulation, or term of UA's CoC, the fact remains that it's not prohibited.
Further, once selecting Denmark to get the ability to pay in Kroner--again something which is not prohibited--I didn't lie one bit when filling out my CC info. UA processed it, accepted it, and sent me a confirmation of my purchase in Kroner.
Lastly, if what you're saying is accurate, UA would have cancelled on the basis of "lies and fraud." Except they didnt. They cancelled them due a 3rd party error.