Casinos will ban some countries from accessing them due to legal restrictions on online gambling.
Many online casinos cannot be accessed outside of certain regions and countries due to licensing issues or geo blocks.
Using a VPN it is often possible to access banned or blocked online casinos.
Certain countries have strict laws against online gambling that make it illegal for casinos to operate or offer their services within their borders.
Even in countries where gambling is legal, governments often have specific regulations which require casinos to comply with local laws and to obtain licenses in which some casinos may not be able to do.
Casinos can also choose to avoid operating in countries where there's a high risk of legal issues, regulatory uncertainty or financial instability.
You can use VPNs also known as virtual private servers or proxy servers to get around the ban of a casino in most cases.