I have nothing of substance to add, but that term moral hazard is not being used as intended. it's a term used to describe when you spend someone else's money it actually doesnt have to do with morals.
It's used correctly here. Advertising to children is a moral hazard because the money used to buy the advertised product comes from the parents, not the children (mostly). The point of advertising is to inform and influence a consumer, but in this case, you're manipulating someone who likely doesn't understand the costs involved, who in turn is meant to influence the actual consumer/purchaser, who are themselves cut out of the loop and potentially buying something they don't understand.
That is only within the context of economics. Outside of that it is fine to use the common literal meaning. Professions don't get to dictate that their jargon is used by the rest of us, even if they coin the phrase.
I don't think that's the case; "moral hazard" doesn't have a conventional colloquial meaning. If you use the term outside it's technical meaning you're just going to confuse people.
It does the same way that “green house” has a conventional colloquial meaning, i.e. a house that’s green. If underwater basket weavers start calling their thimbles “green houses” i will continue to put those two words and quite frankly any words i want in any order that conveys meaning to others without concern for what niches might stamp their feet about it