Not all ESPs force unsubscribe links. We ultimately put liability on our customers for CAN-SPAM compliance. We had CAN-SPAM compliance checks on by default, but

Not all ESPs force unsubscribe links. We ultimately put liability on our customers for CAN-SPAM compliance. We had CAN-SPAM compliance checks on by default, but they could be disabled. As to your original question, no, ESPs have not gained much in the way of power. I might be in the minority in my industry, but I think this is good. All of the arguments against page-based ads can be used against email-based ads. But in this case, the users have won, and have full power over their inbox.