I read somewhere in French press that some fake food company allegedly put melanin in their products to trick the FDA, that the peas they use for their fake food are from China and that those peas are full of poisonous chemicals like Bisphenol A.
Food is composed of naturally occurring ingredients, whereas fake food is made from synthetic ingredients. Food is typically healthier, fresher, and more nutrient-dense than fake food. Fake food is often made to look like real food, but it contains artificial flavors, colors, and other additives that are not found in real food.
I don't think they would try to get caught but they could try to pass the tests to get a FDA approval.