And a good suggestion for the future is to read full T&C before playing somewhere, you don't want to be throwing away your money because you didn't take up 5-10 minutes of your time not to read all the details.
It is extremely strange. The only transaction they can ask (and you can still say no, its your personal account and transaction details are private) to be visible is the one you made to deposit to that casino.
Yeah, its standard. However serious casinos do tell you to cover all the digits except first 4 and last 4 of your card number (and name). The rest you should cover for your own safety, especially the CVV2 number, never show that to anyone!!