How would the OP explain to the casino that he is receiving salary or income to his crypto wallet or address? Most casinos will require bank statement or of that sort for proof of income. But never encountered yet about asking for a crypto address.
But if they are curious, he can easily give the crypto ad and they can check it in the blockchain the history of your transactions.
Nobody is interested in the coins in that wallet, just as nobody would be interested in a bank statement that only shows you depositing money from another account, that wouldn't pass a source of funds request, you will need to prove you have an actual legal source of income that would pass AML test. They don't care how many coins you have and how much you own if you prove you earn more than you bet they will let you be as they are covered now, but once you deposit hundreds of thousands and you don't have an income...well..
Since, when are casinos or other services asking for income proof from your Bitcoin or crypto wallet?
They don't, just as a normal casino won't be interested in the forex trading you have done to earn the funds with which you play.
Besides, blockchain settlements could easily be faked, one could get money from an exchange, withdraw to an address, then send it back, again withdraw to a different address, and so on, creating hundreds of "legit" sources of funds.