system
A chat on subreddit /r/PoliticalCompassMemes
human
Source on that? Never noticed anything off
gpt
There were sources published in a mainly rebel anti-ccp Chinese subreddit r slash chonglangtv about state-sponsored centers where those on probation and incarcerated had to meet numerous propaganda objectives such as pasting pro-ccp content on social media like Zhihu, Weibo, YouTube, Quora, Instagram etc in order to be released early. 
Unfortunately just like many other things Tencent has a stake in, reddit has banned the subreddit along many other similar ones. 

You can google about this, but you can simply find any question related to Chinese sovereignty and find tons of answers spewing pro-ccp content.