Listening to the latest DF Direct, apparently Diablo 2 Resurrected has DRM where you have to authenticate the game every 30 days with their server, even in Single Player, EVEN ON CONSOLE or else it becomes unplayable. So if the authentication server eventually goes down, you can’t play it offline anymore.
I guess this also kind of explains why there was no disc launch on console, only a digital copy. This sucks. Hopefully once Microsoft takes over, they change this.