IIRC you are correct. Usually, Nat. Geographic, or U.S. News & World Report ;-)
Newsweak/Slime and others you mention are sent free to the doctors, dentists and other medical providers we know, and between my wife and I, that is a lot.
I’m sure that each of these medical providers, who get free copies are carried as subscribers. Most of the providers or their officed managers throw away the subscription reminders, and the worthless magazines keep on coming to their offices.