By enforcing the Great Firewall and giving them no way around it, Chinese people's lives became difficult and tightly bound. The internet was created to enable easier and more convenient communications and sharing of information across large distances. By denying all of these to the Chinese people and making more harsh rules, the government has taken away the freedom of information, freedom of press and freedom of expression.
INFORMATION IS POWER
Why would the government choose to do this when it clearly makes life hard for the people of China? Well Information has Power and thus dangerous to the Chinese government. Freedom of information can drastically change and influence people's opinions and views, creating activists and rioters. However, by restricting certain information and only allowing exposure to information that will aid the government and it's goals is a form of manipulating the masses.
China's online controls are necessary to prevent democracy advocates from stirring chaos. - Xi Jinping
By stirring up chaos he meant to expose people to other opinions that may negatively affect the government. By with holding these information, the government is actively preventing people from making their own informed choices.
CONNECTIONS TO THE PAST
The ban on freedom of information is a very communist ideal because communism is often represented by a single dictatorial party. The party having achieved power, heavily restricted internet access because they don't want another party or other leaders such as the China Democracy Party to usurp them. Plus their goal, currently achieved, is Cyber Sovereignty. Meaning to give the government and Xi Jinping absolute, supreme power and control over the internet within their borders. Since Xi Jinping has become president of China, he has taken active measures to restrict even more information on the internet from the people.
"DON'T BUSY WITH MORALS, BUT WITH RULES"
This connects to legalism. The principles of legalism is to make strict laws for the benefit of the people even if the people don't like the laws. "People are infants. People can't rule themselves." They don't know what is best and it's up to the government to makes these censorship laws for the people.
Use authority, not love