Don't trust MI6, he's a shill for a competing sportsbook that has legitimate scam accusations against them.

There are only a few ways I can think of that sportsbet.io would connect your account to those others, and in your case it's likely your IP address.  Are you using a public internet connection to access sportsbet.io?  Are there others who have access to your wifi?  If so, have you been colluding with others to coordinate your wagers?