> That‘s always the most kafkaesque part of these problems and should be illegal

it is very likely illegal to tell him. it was triggered by the use of a gift card, and therefore very likely to be AML, and in many places (I am not sure about Australia specifically) it is illegal to provide information in the circumstances.

Usually if you get punished they have to tell you the crime you committed.

That seems like a dangerous loophole.

Imagine being banned from all online activities without any reason given.