https://www.theverge.com/2018/6/11/17451484/steam-china-announced-valve-perfect-world

Valve plans to bring Steam to China in an official capacity, expanding the reach of its distribution service and games library to a huge additional audience. The plan was announced today in conjunction with Perfect World, a Shanghai-based company that Valve previously worked with to distribute local version of Dota 2 and Counter-Strike: Global Offensive.

Steam can already be accessed in China, but it appears to be more of an unofficial availability that risked being blocked by the government — as some portions of the service recently were. By partnering with a local company, Valve can ensure that Steam remains live. It can also better localize the service and promote it to more gamers in a country where gaming is booming (though that’s largely thanks to mobile). The partnership sounds similar to the one forged between Blizzard and internet giant NetEase, which operates the developer’s Battle.net in China, bringing titles like Overwatch and StarCraft II to a major market.