Well i'm a china mainlander and i might be able to provide something about pornography and bestiality in China mainland
In china the gov does not have laws against bestiality itself, but strict bans on nudity and pornography do exist
e.g. one won't be sued for 'having sex with canine in street' even if caught, but will probably be detained for a week or 15 days for 'nudity in public'
On the internet, porn sharing is also completely banned in law. A lot of websites like pornhub, twitter, youtube, instagram, google (and many more) are banned. But things like vpn allows access to these websites, so as long as one's willing to get a vpn, s/he could see the banned information. Moreover, online porn forums are frequently created, banned, and moved to another website, and get caught and banned again. It seems to be a loop, but i believe many such forums exist beyond official administration. (But plz don't ask me for such websites cuz i don't know many of them-i use pornhub and twitter; these local forums are mainly for those without and could not be bothered to get a vpn)
And there's one thing interesting about the online bestiality sharing.
Chinese gov seems to unintentionally exclude bestiality from porn. While most website containing human-on-human porn are banned (even if they're only minor websites), bestiality things are less likely to be banned. Probably bestiality is the most available type of porn without using a vpn in china mainland. Type English criteria like 'Dog fuck girl' in baidu (a counterpart of google in china) and many websites appear.
No wonder this forum is not banned in china.
Hope it explains the situation and rectifies some stereotypes in China.