Can something like McDonalds be considered a life form?
No. First of all, an "organism" is not automatically a "life form". And it is easy to see that McDonald's does not have an information repository in the form of a genome-like structure, where mutations are quantum-acausal, but still have causal consequences on the bearing reproductive units and they trace an evolutionary path all the way down to the ancestor. In your food stores there is no such a thing. Everything is just engineered and organized by us humans. This is "intelligent design" (although fast food is not really an intelligent thing to do) and has nothing to do with evolution in the biological sense.