The idea of opt-out is the email no longer exists to be sent to. Otherwise, to mention opt-out implies the data is still present in a form that cannot be option

The idea of opt-out is the email no longer exists to be sent to. Otherwise, to mention opt-out implies the data is still present in a form that cannot be optionally transformed. This sort of goes to the idea of whether email addresses are "owned." They're essentially strings--but residing in a different system, are there any associated rights to it as an identity? > keep charging you without even throwing an email It's not mandatory, I think. However, observing auto-pay at other places, an email is sent. Other sources outside of email are available though, like bank statements and invoices.