Regarding the Chinese replacements for the international platforms, we can have the following:

Facebook: WeChat Moment

Youtube: Bilibili

Whatsapp/telegram: Wechat

Discord: QQ

Twitter: Weibo

Reddit: Baidu Tieba

Twitch: Douyu/Huya/Bilibili

Instagram: Xiaohongshu

So, Steam is something like a grey market in China,and the Chinese government is opening one eye and closing another eye on it Almost no Chinese players are playing PC singleplayer games on Wegame, the players using Wegame are just those playing Tencent's online games, like League of Legends

The games on Wegame, need a license. Besides Steam, there is also a PC game platform, called Wegame, by Tencent https://www.wegame.com.cn/home/ like the one that I am using, every day When I open the computer, I will open it

There is a Chinese version of Steam, the Chinese publisher is Perfect World, but no Chinese player is using it

All of international social, messaging apps, software, and platforms are blocked in China, including but not limited to Whatsapp,Instagram,telegram,Youtube,Twitter,Facebook,Linkedin,Discord,Reddit,all Google's products and services,Dropbox,Twitch...,and only Skype is free to use in China.

We can use VPN to connect to these blocked platforms,but VPN is also something that the Chinese government is increasing efforts to crack down on these years...

It seems that by the Chinese regulations and laws,the people found using VPN secretly will be fined under 15,000 Chinese RMB, but for the people around me who have used it , including me, nobody have been found and fined so far.

In terms of the game platforms, the international version of Steam could be used in China but we need to use an accelerator, which is not a difficult thing to do.

The console had been forbidden in China for 20+ years and just got restored a couple of years