For one there’s zoning laws, most property do not allow any construction, so you’re fucked for shelter. Likewise if you’re on agriculutrally zoned land as most of those large rural parcel are you are legally required to use it for farming. You can’t just go and fell trees or hunt animals, so you’ll be fucked for food. And if the council ever finds or hears of you living in such a place, they’ll send the police for you.

Linking to a few mansions in the bush isn’t the same thing as being able to just go fuck off to woop-woop for the rest of your days.