The primary reason a sportsbook asks for your SSN is to verify your identity. Sportsbooks must follow Government and Gaming regulations to prevent fraud. They do so by following the Bank Secrecy Act. With many digital products, you can make new accounts with new email addresses.
Bet365 Sportsbook is available only in Colorado, New Jersey, Louisiana, Ohio, Virginia, Iowa, and Kentucky. Therefore, the popular betting site is not yet legal in the other 43 U.S. states. However, it is expected that Bet365 will enter new states and jurisdictions in the not-so-distant future.