Some of the things they mentioned for you to check doesn't warrant if casino have reputation until you experienced it yourself because people see reputation like reviews and wouldn't be able to verify until they check it. On a personal level, I will recommend some here and from signature adverts you can see them but it's possible for casino to have everything and then default later, there is one currently having problem in this forum with some users with their backlogs.

Here are some tips:
-Check the type of domain and verify when it was registered.
-Check if the casino is a register one and their company register number, don't rely on licence aloe because that can be forge.
-Check the origin of the casino.
-The team behind it.

Good luck.