Exchanges and casinos block ips from the United States but everyone just uses a VPN, why even block their ips in the first place when you know they are going to do it anyways. I'm guessing they do it so they have some type of deniability?
They have advantages like they won't refund you any funds if you are having issues on your account and ask you to submit KYC then you are from a country where their site is banned.
They just follow the rules and get benefits,if you are using VPN to access banned site you hae risks as well.