This is a very common Reddit take. Has it ever happened? Many of the top stories on /r/news and /r/worldnews right now are about how China disappeared a dissident tennis player. Stories about the Uyghur genocide are regular appearances. Every June a million posts about Tiananmen Square get posted and highly upvoted to /r/pics and other major subreddits. These posts are not deleted. They are not removed by moderators. They are still there to find to this day. The overall amount of them has gone up since Tencent bought a (fairly small, about 5%) stake in the company, if anything. The only subreddits I know of that remove anti-China posts are tankie subreddits and /r/sino, and those are basically propaganda and everyone knows it (and they certainly aren't "main subs.")

Lmao are u kidding they’re so regularly popular

How have they been censored? Isn’t one of the top posts or r/pics about tianamen square?