We are committed to keeping the world of Sanctuary a safe and fair place for all players, and our Game Security team constantly monitors for cheats and unauthorized modifications. All Diablo IV players agree to the Blizzard EULA as a condition of playing the game. The Blizzard EULA explicitly prohibits cheating, bots, hacks, and any other unauthorized software which automates, modifies, or otherwise interferes with the game. This is important to players’ security as well as the game’s long-term...
Diablo 2 successfully had both open and closed battle.net options for decades, and while technically map hacks were still not allowed, I’ve never met someone who was banned for having them, or any other hacks, on open battle.net. It was fine, and gives people who want to hack a place to do so without needing to bother other players who tried to play legit.