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.
They will definitely accept that but not if you're salary is only $500 a month and you deposit $500 weekly that would make it questionable and the casino will ask you for more proof of income not only on your salary but other documents that will prove that you can sustain your bankroll and you are not working just to gamble, even if you're living with your parents there should be right allocation on all your basic needs.
Nope, they, the casino, will accept the documents you've sent whether or not the amount listed on your pay slip is lesser than what you usually deposit and gamble on their platform. Those documents that they've ask for a proof of income is just an additional verification to support your initial verification, that is also why they ask for the most recent pay slip, so they'll be able to validate it better on their end. Also, just because you're earning lesser amount on your job doesn't mean that is the only way you earn money, there are investments, assets, gambling, trading, freelancing and much more that doesn't provide a pay slip. You're not applying anything like a credit card or loan on a gambling platform for it to require a certain amount of income to be qualified.