In the US, we have hundreds who pull it off by living in National Parks. In addition to hunting and gathering, they must constantly evade efforts by Park Rangers to evict them. (Tourists do far more damage to the park with litter, etc.) Ironically, squatting in city/suburban homes is encouraged by current Democrat local governments.

Also, effective farming/hunting/gathering requires decades of experience. It's one thing when you grow up learning the habits and uses of local plants and animals from your parents. When forced to relocate to a completely different ecosystem (as was done to the Cherokee in the US), you have to start over from scratch. I did learn some gathering from my mother (we went on "picnics" bringing no food, but gathering with her supervision instead). My very modest goal is to add one cultivated crop each year. I started with butternut squash - now an old friend. Added beets, tomatoes, and blueberries last year. We already have wild friend in the yard - blackberries, lemon balm, purple deadnettle, dandelion, peppermint, lambs quarters,plantain. I'm wondering how we can use the onion grass. Thistle is just too hard to utilize - it gets yanked (with gloves!). Yard has been pesticide free for 35 years (except what blows from neighbors).