You can have "read" access anonymously (with a big asterisk, see the end), but as soon as you need "write" access, the service provider (the website etc) is legally required to verify your ID. It's why there's no pseudo-anonymous discussion forum in China, at least legally.

Source: https://www.gov.cn/xinwen/2016-11/07/content_5129723.htm

> Cybersecurity Law of the People's Republic of China, Article 24: When network operators provide users with network access, domain name registration services, fixed-line and mobile phone network access procedures, or provide users with information publishing, instant messaging and other services, they shall require users to provide real identity information when signing an agreement with the user or confirming the provision of services. If the user does not provide real identity information, the network operator shall not provide the relevant services to the user.

The big asterisk: there's no anonymous internet service in China, you have to ID yourself to get access to the internet (article 24), and the service provider are required to keep record of you (IP and everything) (article 21), and they are also required to cooperate with the authority (no surprise here) (article 28). And using VPN or Tor is likely illegal (article 27).