Curiously, in the past few days I have seen several articles about the "hidden economy of unschooled people". I guess the fact that those publications all chose to use the word hidden in the headline echoes what you say, but now that it has been widely reported and is equally fresh in the minds of the public, it is strange to see that they still hold on to those legacy ideals.
It's not curious, it's called "pinning": Articles that are tangentially related to some popular interest topic get readership for that topic as well as the subject of the article itself.
