At some scale, if the infrastructure is an effective monopoly and is necessary for life, then the simpler exclusion mechanisms become infeasible
How exactly do they become infeasible? The fact that someone can’t live when excluded doesn’t prevent you from excluding them. And since the goal takes priority over justice or fairness, you wouldn’t care that they can’t live.
How exactly do they become infeasible? The fact that someone can’t live when excluded doesn’t prevent you from excluding them. And since the goal takes priority over justice or fairness, you wouldn’t care that they can’t live.