When I travel to China with a mobile phone subscription that supports roaming, I get completely uncensored access to the internet. Surely this is according to Chinese rules.
Likewise all the expats and Chinese I have met all used whatever they wanted of US social media plus they had a shit ton of pirated(?) American TV shows and movies.
Perhap the policies are changing? I don't know but this particular case sounds like a very modest fine (200 yuan) for using a VPN and sizeable fine for not reporting (and being taxed on) a foreign income.