Over 40,000 Steam accounts were VAC banned the day after the sale ended.
Valve uses its VAC system to identify and ban user accounts which are found to be using cheat codes in-game - a practice which the company disapproves of since the very beginning of their existence.
This absolutely crushes the last banning record, which was set back in October of a year ago when Valve banned 15,000 accounts. Allegedly, players were buying games like Counter-Strike: Global Offensive and Dota 2 at a discount on new Steam accounts so they could test various cheats. This looks like it could be the case, since nearly every day after the mass ban, the numbers of people removed from the service has been less than 1,000 a day - normally, it's around 3,000 a day. All I do know is that cheating isn't cool, and Valve seems to feel the same way.
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On July 7, the day after the first hit of the ban wave, 954 VAC bans were handed out, while another 735 were delivered on July 9. Until now, the biggest one was the October 2012 ban where the platform had banned 15,000 users. This information comes from Steamdb, where you can see a steady graph of bans each day - and the graph for July 6 shows a massive spike. Either way you go, if you cheat on Steam, you will likely be picked up by the Valve Anti-Cheat System and promptly banned.
The time of the ban and the end of the sale is not o-incidental but intentional, reported Dot Esports. "If a VAC ban is determined to have been issued incorrectly, it will automatically be removed".