Sometimes the SBR mailbag gets stuff like this. Players will deposit and be so fearful of providing their documentation for unknown reasons and demand to have their funds returned. The bottom-line is that good books follow Know Your Customer (KYC) regulations either as a condition of operating a gaming license or just to protect themselves and unsuspecting third-parties of identity fraud. If you're going to send your funds to a sportsbook, you should be prepared to send ID/utility bill too.