Didn’t realize there were so many legal complications around gambling in the US. I knew some states had restrictions, but I didn’t expect that even deposits and payments could be blocked like that. No wonder many casinos just choose to ban US players altogether — looks like the easiest way to avoid trouble.
On top of that regulatory and compliance nightmare you also have Federal and State laws and those could be different. According to Federal laws, something could be illegal but the State in their territory makes it legal. In the end, who is right and who is wrong? Federal agencies could prosecute you while law enforcement in your State lines doesn't think you did anything illegal.
Marihuana, for example is one such thing where there is a conflict between Federal and State laws. According to Federal laws, it's illegal, but some States have made it legal. In theory, the FBI or another Federal agency could arrest you for possession but the State you possess it in doesn't mind that you have it.