@OP would you mind confirming what bobstone(duckdice.io representative) stated?
to be clear OP also deposited and withdrew without gambling using fiat methods, in such cases we have to do our due diligence and comply with AML procedures.
okay, this is understandable, it can be suspicious when a gambler deposits at an online casino and then withdraws without gambling.
Anyway, reading the part of your post that I quoted, are you saying your gambling site does not have any wagering requirements for deposit? From what I have seen, a lot of gambling site has implemented a wagering requirement(usually 1x-5x, some even require 10x) even for deposit only to combat money laundering, I am surprised yours haven't implemented it.