Can you tell us which country has banned crypto gambling and trading site? This also means that the country must have put a complete ban on cryptocurrency usage. Is it so?

You may access these ban site by the method you told or through VPN, but this is indeed risky. For example, what if your country stops the SMS messages from Binance too and you are unable to login as you never recevie the one time password from binance. No vpn can be helpful in this case. Also if you are not careful, your ISP can track that you are accessing the banned site sportsbet.io etc.