What is suddenly blocking me from accessing this site?
It loads the site and I can see my balance, but the site is now putting up a message that I cannot access sportsbet.io from my jurisdiction...
Also, how is it telling my jurisdiction? From my IP?
What can I do to get around this?
Maybe that is a recent change, either in your country or in sportsbet.io. Either way since you usually didn't had any problems in the past, maybe if you talk with the help service from sportsbet.io they will explain the situation to you, and I think they should at least cash out your funds if you are not allowed to play there anymore.