Once they touch the factory floor’s floor, plastics become filthy and cannot be used for high-quality applications - food wrappers, anything with body contact. Oils and heavy metals are the biggest contaminants, a plastics-producing company I used to work for concluded. They either sent it all to a recycling factory or used it for very low-quality stuff like trash bags.
Now with post-consumer plastics, not only are they extremely heterogeneous, they will also have even worse contaminants like mold which proved to be very resistant to cleaning, a EU study concluded. So you might want to pyrolyze them like you do with crude oil, but there’s just too much O, N, S and halogens, so the output will be too corrosive, but also too heterogeneous for it to make economic sense.