Where is the option for Google to pay me if they choose to use my image or likeness in "Shared Endorsements"? I can't see why anyone who is even a minor celebri

Where is the option for Google to pay me if they choose to use my image or likeness in "Shared Endorsements"? I can't see why anyone who is even a minor celebrity/blogger whose livelihood depends on being in the public consciousness would want to enable this option. The other question is "what happens should Google fail to respect my choice not to enable shared endorsements?".