Average none, though 2.5 Gbps is getting more and more common and WiFi is catching up too. You could max out multiple slower devices at the same time without hitting the limit of your uplink. I don’t have a use case for that, so I’d only upgrade from my current 1 Gbps to higher speeds if the price is comparable. That doesn’t mean that others don’t have a use case for it.
You can’t expect any country to take the international court seriously if you don’t do it yourself. The logic that you’ve just used is exactly the kind of logic that countries would use that don’t want to be held accountable for their actions that go against international law.