We had an internal auditor about a year or so ago tell us that we should remove the "opt out" line for the same reason. They said the customer can "opt in" but there is no "opt out." Unless they "opt in" customers are automatically out of the program.
I have not been told about sending the information after account opening. We provide ours at account opening, then once they qualify the system adds the program to their account if they opted in.
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My views only.