Ok, suddenly the casino you're playing asks you for proof of income to be able to withdraw your winnings and to keep your account in good standing, your bankroll every month is $500 and you provide proof of salary that you are making $500 net every month, will they accept that proof will they accept that you are putting all your salary for gambling, will this violate the principle of gamble for fun, because you are working to gamble based on your proof income.
I mean why not? They should consider that you work even before you deposit on their gambling site and the one you deposit might either be from your savings. I think they will just check if it was really a close to your deposit for example you are ordinary employee with an average of $500 but you deposit $20,000 wouldn't that be a little bit sketchy? If you deposit around $2000-$5000 I think that could still be acceptable.