No need to find a halal casino if someone want to gamble, a normal casino is same. After all it's back to your belief and what you think is right, if you think gambling is haram, just avoid to gamble.
They might use the name as Halal casino so they can attract Muslims to play in their casino. The Truth is it's Haram in Islam and practicing Mulism won't play there because if someone do business with the name of their religion, it's a trap.
Not really, conventional bank is haram in Islam, but if the bank is using Islamic name e.g. sharia and then they claimed to not offering interest rate, actually it's legal. Do you want to say Sharia bank is haram? you will get mocked and bullied by Muslims