World of Warcraft did not initially support Battle.net, because until the revision of the Battle.net on March 20, 2009, which forced players to merge their World of Warcraft accounts with the new accounts Battle.net, they had separate accounts of Battle.net. Among the Battle.net features used in World of Warcraft, include the ability for players to engage in cross-realm, cross-faction and cross-game chat, which allows players to talk to their friends on their real ID friends list, other factions, other servers as well as other games like StarCraft II and Diablo III.  On November 11, 2009, Blizzard Entertainment Battle.net a mandatory feature for World of Warcraft players.  Battle.net was the first online gaming service directly integrated into the games that use it, unlike the external interfaces used by other online services at that time. This feature, combined with the ease of account setting and the lack of dues, has made Battle.net popular with players and has become an important selling point for diablo and Blizzard games. Since the successful launch of Battle.net, many companies have developed online gaming services that mimic Blizzard`s service pack and user interface. The Windows version of Destiny 2, developed by Bungie and released by Blizzard`s siblings, Activision, was sold exclusively and released as part of the Battle.net on its Windows version on October 24, 2017 and used to support the game`s matchmaking capabilities, making it the first non-Blizzard-supported game by the Launcher.  Blizzard has confirmed that players can use gold breeding in World of Warcraft to generate credits for their Blizzard account that they can use to purchase Destiny 2.  Blizzard also stated that they were assessing “potential needs or opportunities for future activision games” supported by the Battle.net;  with Call of Duty: Black Ops 4, due out at the end of 2018, as the second title for the service.  Blizzard stated that it did not intend to extend similar support to other third parties because it was concerned that this would weaken their quality control of the product.  The publication of StarCraft in 1998 significantly increased the use of the Battle.net service.
Features such as scale ranking and game filters have been added to the service. Battle.net became bigger after the release of the StarCraft expansion pack: Brood was even bigger, tens of thousands of players signed up at some point (still today). StarCraft Battle.net was particularly successful in South Korea, where the number of registered players was often several times higher than that of the United States. When the service was launched on December 31, 1996 (the first game to use the service was Diablo, released a few days later on January 3, 1997), Battle.net offered only a few basic services such as cats and playlists. Players can connect to the service, talk to other players and join Diablo multiplayer games. Apart from the user account data, no game data was stored on the Battle.net server. If a player is associated with a game, he would connect directly with the other players in the game. No data was sent to the Battle.net servers. While this made the service quick and easy to use, it quickly led to widespread fraud, as players who use cheats could change their game data locally. However, because there was a way to create private games, many players played with people who knew them. You are responsible for the privacy and use of your username and password.
You are responsible for all uses of your data, even if you don`t allow it.