Anything that might reveal to Chinese citizens that the CCP is evil.

google, facebook, amazon, twitter, github, you name it ...

Not sure where you get your info, but github definitely isn't blocked. And there is a amazon.cn, just no one uses that crap.

I am Chinese and lived in China until this year if you want to know. For github, the situation is a little complicated, you can read this: https://www.reddit.com/r/China/comments/v8fv0p/why_is_github.... For Amazon, I mean amazon.com, not amazon.cn. Also amazon.cn's services are declining, almost nothing there.

Also Reddit (ironically Chinese owned).

Reddit's owned by the Chinese? I thought they were owned by a US-based conglomerate called Advance Publications, which is the same group that owns Conde Nast.

Tencent owns $150 million of it (based on its 2019 valuation anyways).