As posted above from saint loop, Sportbet isn't banned my country. If they don't banned my country, is i'm getting wrong use that trick?
Afaik, changing DNS will result in changing the ip address just like using a VPN. It would also not avoid account freezing consequences if they implemented this policy as it is part of an attempt to hide the real location of your device (something casino sites generally anticipate). This means that you must be ready to KYC at any time.