That's nice. But you still don't know how the opt out has to be worded in a specific case and through which medium to which address it should be sent. So, yes

That's nice. But you still don't know how the opt out has to be worded in a specific case and through which medium to which address it should be sent. So, yes, you could build a TOS alert system of some kind. And that might be a nice and popular plug in. But an automatic opt-out button is very hard.