Nrf hasn't been updated in a very long time, but as you say you can whitelist/blacklist pretty easily. Sadly, netguard doesn't have this facility as a global, a

Nrf hasn't been updated in a very long time, but as you say you can whitelist/blacklist pretty easily. Sadly, netguard doesn't have this facility as a global, and only allows it to be done on a clunky, per-app basis. I seem to recall the author not being receptive to the idea.