I think those are just not great examples. There are plenty of examples of black markets for legal things, including food stuff.
Example: instead of buying meat at a formal (as in, legal business that pays taxes, has the proper sanitary reviews, etc) butcher shop, its buying from a small producer who kills their own animals, or from some shady figure who kills other producer’s animals.
Another example is alcohol and cigarettes that are bought at duty free shops by mules and then sold tax free in street markets.
The edge of the black market over lawful business ranges from small to huge depending mostly on how regulated the lawful business is and the costs of a physical location (think street sales of snacks right across from a shop that also sells snacks but also has to pay rent, utilities, taxes, etc).
Example: instead of buying meat at a formal (as in, legal business that pays taxes, has the proper sanitary reviews, etc) butcher shop, its buying from a small producer who kills their own animals, or from some shady figure who kills other producer’s animals.
Another example is alcohol and cigarettes that are bought at duty free shops by mules and then sold tax free in street markets.
The edge of the black market over lawful business ranges from small to huge depending mostly on how regulated the lawful business is and the costs of a physical location (think street sales of snacks right across from a shop that also sells snacks but also has to pay rent, utilities, taxes, etc).