I think just about every industry that seems, from the outside, to have exploitable conditions like this has hidden barriers. The taxi industry looked exploitable, but in fact was tightly regulated. Uber has managed to capture some of the market by pretending to not be a taxi company, and wound up in a plethora of legal battles for their trouble.
I propose that how obvious or necessary a business idea appears at first glance is directly proportional to how difficult it would be to implement.
You can't be a food distributor if you're not distributing food. I've gone to our local small business seminars for food service, and I've been told that as long as you're not handling food at any point, you can't be held responsible.