In my country the differential switch is mandatory, every circuit must be protected, be it from a main one or separate ones for each circuit. I'd be surprised if it weren't the same all over the EU.
If the abundant resources are obtained through unbridled agriculture (deforestation) and excessive amounts of ecosystem-destroying pesticides, maybe they're not sustainable
They use whatever trackers you set them to.
In truth you set the trackers in prowlarr (if you're still using jackett, it's time to switch)