Antibiotics cost the grower money. They are used because they save money in feed costs and reduce mortality. It takes about 2-3 weeks longer to reach the same weight without antibiotics than with them. The USDA's definition pertains only to how the chicken is processed, i.e. whether any substance, such as a basting additive, is injected into the bird at the processing plant. It has nothing to do with how the bird is raised, what it is fed, or what it is medicated with, as long as no artificial ingredient is administered.
Nobody does it.
There are no preservatives used on fresh chicken or frozen chicken, and no chicken has excess fat. There are companies in the marketplace that make these misleading claims which infer that those not making the claims contain these undesirable qualities. There may be many. There is a big difference among the many breeds of chickens offered in the marketplace. Numerous companies compete in order to produce the fastest growing, best feed converting, lowest fat, biggest breasted, disease resistant, egg producing strain.