That’s because these people do not want to actually live this way. They are cosplayers. They want to buy $50 worth of freeze dried food and go to McDonald’s.
Your grandmother learned to live like that because she had no choice. That’s what growing up in the Depression will do to you. No grandma would ever have freeze dried ice cream. Better learn how to milk a cow! Free milk, cream, and butter every day. But it’s not easy.