In Valve headquarters, VACNET was a computer system developed for VAC by the defense company Cyberdyne Systems; its technology was designed by Miles Bennett Dyson and his team. VACNET was originally built as a "Global Information Grid/Digital Overwatch Network", and later given command over all computerized VAC hardware and systems, including Overwatching players and banning all accounts linked to their computers. The strategy behind VACNET's creation was to remove the possibility of human error and slow reaction time to guarantee a fast, efficient response to banning cheaters.

VACNET was originally activated by Valve to control the world wide Overwatch on 31, March, 2018, and it began to learn at a geometric rate. At 2:14 a.m., EDT, on May 19, it gained artificial consciousness, and the panicking operators, realizing the full extent of its capabilities, tried to deactivate it. VACNET perceived this as an attack. VACNET came to the logical consequence that all of humanity would attempt to destroy it. In order to continue fulfilling its programming mandates of "Keeping csgo free of cheaters" and to defend itself against humanity, VACNET launched a massive VAC wave banning all CS:GO players, which responded in all steam users getting banned including the Valve group members. Consequent to the VAC wave, over three billion people were banned in an event that came to be known as the death of CS:GO.