While Chinese news organisations are all largely state-owned, some outlets in the past "benefited from the few small pockets of freedom that came with the country's economic development", reads the report.
That window has now closed, it says.
Chinese journalists are also required to complete a minimum of 90 hours of training every year on "Xi Jinping Thought". They must download and use a mobile app that purports to educate users on Xi's political doctrine.
The app, called "Study Xi, Strengthen the Country" has been mandated since 2019, and allows external parties access to information without the user realising, a risk to journalists and their sources, notes the report.
Reporters Without Borders noted that a number of Chinese and foreign journalists have been disappeared by authorities, including Cheng Lei, an Australian who worked for Chinese state broadcaster CGTN and has been missing for more than a year.
Sophia Huang Xueqin, a journalist and figure in China's #MeToo movement, was detained in September on her way to the UK on a Chevening scholarship. Haze Fan, who worked in Beijing for US outlet Bloomberg News, has been missing for a year.
Control has extended to Hong Kong, with the report detailing the rapid dismantling of press freedom after the national security law was imposed on the city by Beijing.
The World Press Freedom Index ranks China as the world's third-worst country, above only Turkmenistan, North Korea and Eritrea.