Dont sweat the small stuff guys.....
BIG DEAL.... delete the email and move on if you are not looking for offers.....
I get SPAM in my email, my regular mailbox, I get telemareting calls, I get hundreds of flyers I dont want left at my door every day.
I also get these calls from MANY MANY types of businesses not just sportsbooks....
you are wasting valuable energy if you let this bother you.
(IMO)