I imagine the idea is that any DNS-based filtering tech would also block use-application-dns.net. An ad-hoc spec. Kind of like how captive wifi portals "block"

I imagine the idea is that any DNS-based filtering tech would also block use-application-dns.net. An ad-hoc spec. Kind of like how captive wifi portals "block" (or allow) canary domains like captive.apple.com so the OS throws the captive portal login dialogue.