LOL, maybe so. But some of the homesteading videos on Youtube show people receiving shipments of anywhere from 30 to 120 chicks, which they raise as meat chickens, then after 8 weeks they slaughter them and freeze them. That's a lot of meat. Probably not for everyone. But imagine going through about 15 chickens a year, out of your own freezer, totally separated from the industry except for a breeder.
Then there's the freezer. Opting out of the (very efficient) chicken distribution system and choosing your own less-efficient freezer from whatever power grid, is arguably not going to be a smaller carbon footprint or whatever.
Its hard to beat big Ag for efficiency - that's cash-money to them and they've been at it for a century. Cottage industry agriculture is generally orders of magnitude less efficient.