Counter-Strike: Global Offensive is a game from Valve, you can read its policy on the website: https://store.steampowered.com/privacy_agreement/
Counter-Strike is the most popular online team shooter in history, and for good reason. More than a decade on it is still the best and the most entertaining game of its type, it has the best settings and is the best place for gamers to really show their mouse skills.
For the uninitiated, Counter-Strike is a first-person shooter where two teams must face each other to achieve a set objective. These two teams are split into terrorists and anti-terrorist strike teams, and must fight against each other to place, or deactivate bombs or keep, or rescue hostages, respectively.
Before every round, each team has a few seconds to buy equipment. They can choose different weapons, body armor, grenades, and even bomb disposal equipment. All this must be bought with the money earned in previous rounds.
This particular version of the game, distributed by WarZone, includes all the legendary game modes from the franchise such as CS_Assault, DE_Dust, CS_Mansion, DE_Aztec and many more. What’s more, the game takes up less than 300 megabytes and doesn’t require anything extra to play- simply install and go.
As usual with Counter-Strike (although not so common in modern games), you can play online or over a local area network (LAN). For the latter, you can use other apps like the excellent Hamachi.