widely condemed by both China and the Soviet Union as a fascist masquerading as a comunist

I don't think China did that, the MFA usually has a strict "non-interference in internal affairs" as per the five principles of peaceful coexistence. Deng met with Pol Pot multiple times in the 80s. When Vietnam invaded Cambodia in Dec 1978, China did a retaliatory 28 day invasion of Vietnam in Feb 1979. Kim Il Sung even had the Changsuwon palace ready for Prince Sihanouk to stay in during the coalition government insurgency against Vietnam.

To my knowledge: China, Korea, and most of ASEAN at the time supported Pol Pot and the coalition government, while the the Warsaw pact countries (except Romania), Albania, Cuba, Vietnam, Laos, and the current Hun Sen government condemed Pol Pot. Romania and Yugoslavia stayed neutral. It was a fairly even split on the issue for communist countries.

Third worldists in control, trust the plan

End to end encryption chats are banned in China btw

I know imessage is commonly used and it's e2e. The firewall is a blacklist not a whitelist, and Github isn't blocked. They would have to manually block any server that hosts matrix/xmpp if they wanted to actually enforce that. The most annoying thing they do (at least in Shanghai) is the ISP's have raw.githubusercontent.com resolve to 0.0.0.0, but you can just manually add the ip in your /etc/hosts file. Maybe it's to make downloading releases tarballs more annoying to encourage domestic alternatives?

based. the future is chinese

We're going to do it again and there's nothing you can do to prevent it, sorry.