If you need to deposit before you can withdraw, it's most likely a scam.
Many casinos always ask you to make a Deposit before withdrawing to confirm your identity or confirm the method of payment and deposits.
This is a common procedure in such institutions and it is not called fraud.
But in this case, this is nonsense, I have not heard of any casino that will only use 0.0005 to confirm the wallet, most likely the author himself is lying.
I would like to look at the screenshots and rules of this casino or whatever it is.