I was in China for about a month, up until a couple weeks before the covid outbreak started. The internet was so locked down I could hardly do anything. Thankfully I had set up my laptop and home server with Wireguard, so I was able to route everything through my home server back in the US. Interestingly, the factory I was in had a room with a "special" connection to the internet, which apparently wasn't nearly as locked down (but probably monitored heavily). This was so they could do things like video calls with businesses outside the country. I don't know if this is representative of China in general, but it was certainly oppressive.