I can think of a few reasons why casinos limit people's accounts.
- Preventing problem gambling: Casinos are responsible for protecting their customers from gambling addiction. By setting limits on how much money customers can bet, they can help prevent problem gambling.
- Protecting their profits: Casinos are businesses that need to make a profit to survive. By setting limits on how much money customers can bet, they can protect their profits and ensure that they stay in business.
- Compliance with regulations: Many jurisdictions require casinos to limit how much money customers can bet. This ensures that the casino operates within the law and is not facilitating money laundering or other illegal activities.
Duelbits may have had a reason why they limiting OP's account but we all know casinos are profit-driven platforms they will let you gamble as long as your account is not questionable so your point number two is the one that is likely the reason.
Casinos will not hesitate to restrict your account when you are beating them but will encourage you to wager more if you are an unlucky player.