I wonder, if a learner has an appetite for "junk learning", whether s/he needs to be put on a restricted diet or given more criteria to interpret what they are getting fed. I suspect that most formal content appears intrinsically useless, tasteless, "devoid of nutrition" -- unless it's tied to a job skill like "flying helicopters". Restricting the diet amounts to "blaming the victim" who has lost his/her taste for valuable learning from so much junk content.