I'm betting (no pun intended) that in order to cash this in, you have to give them your CC in order to get $10.
Clicking the "SUBMIT" button indicates that you are aware of the following terms and conditions of membership:
Must be 18 years or older.
Canadian residents excluded.
Minimum withdrawal is $20.
Limit of one free comp per household. If you have already received the free comp once from a site that is a member of the Casino Affiliate Network, or at Cybersportsbook.com, you are not eligible to receive it again.
No thanks.