512K accounts from Open CS:GO (opencsgo.com) were exposed in this breach. Besides email addresses, it included avatars, iP addresses and phone numbers.
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AvatarsEmail addressesIP addressesPhone numbersPhysical addressesPurchasesSocial media profilesUsernames
In December 2017, the website for purchasing Counter-Strike skins known as Open CS:GO (Counter-Strike: Global Offensive) suffered a data breach (address since redirects to dropgun.com). The 10GB file contained an extensive amount of personal information including email and IP addresses, phone numbers, physical addresses and purchase histories. Numerous attempts were made to contact Open CS:GO about the incident, however no responses were received.
Source: Have I Been Pwned (CC BY 4.0)