Traditional sportsbooks have your address, your phone number, your email address, and more info about you. Some sportsbooks sell your information to list creators. Those list creators sell the info to tout services that call you to get you on board with their plans.
You should already know this is same characteristics you have with banks, fiat casinos and centralized crypto casinos. Fiat casinos may not request for your picture but centralized casinos among other things requested may further ask to see your face which in fact is very discouraging. So what point are you making with this? I'm sure your link could be about a casino running on KYC.