Unfortunately most users are not aware of the difference let along the implications, and those that are may not really have much of a choice of ISPs (maybe all

Unfortunately most users are not aware of the difference let along the implications, and those that are may not really have much of a choice of ISPs (maybe all the options available to them, or at least the affordable and otherwise practical options, use CGNAT). And in that circumstance there isn't going to be enough “voting with their feet” to make providers sit up and listen.