The practice isn't designed to make things clearer for the user, it's a dark pattern. It's designed so that the user either doesn't notice or feels guilty about

The practice isn't designed to make things clearer for the user, it's a dark pattern. It's designed so that the user either doesn't notice or feels guilty about choosing to opt out. If you wanted to design a clearer interface, you wouldn't hide the "no" option, you'd make it parallel to and near the "yes" option so it was clearly conveyed that you have two options.