If you were the casino manager would you fire the casino worker for interfering with your business or would you ban the gambler from visiting the casino?
This answer differs from person to person based on personality, If it is a greedy human...they may choose to quickly fire this casino worker, but if you consider that because of the relationship this worker has with this chronic gambler they have lost control and acted unprofessionally, you may just scold them and caution against such unprofessional acts, but at the same time consider what caused her to act recklessly and try to add such a user to exclusion list so they have restricted access to your casino, maybe it can assist after all just his loss will not affect your profit.
A casino manager should not be biased, but should always be balance in his decision making. Firing his staff will only cause another problem, so it would be better if he can talk to him in a serious way and advise him not to do it again, regardless of how the customer behaves. Also, the manager should not ban the gambler because he's still bringing profits to the casino. However, he can advise him to prioritize his family first especially that his wife needs more time and financial assistance from him. And that won't happen if he keeps gambling all his funds and lose everything in his pocket.