In the 35 years since the crackdown, all discussion of the incident has been heavily censored in China, as authorities have effectively attempted to erase it from history. Public commemoration or mere mention, online or off, of the Tiananmen crackdown is banned.
Regularly since 1989, activists in mainland China have been detained and charged with “subversion” or “picking quarrels” if they commemorate those who were killed, call for the release of prisoners or criticize government actions during the Tiananmen crackdown.
The government has never accepted responsibility for the human rights violations during and after the military crackdown or held any perpetrator accountable. With each year that passes, justice becomes ever more elusive.
How does everyone in china know all about it if the CCCP scrub internet posts about the event?
https://www.amnesty.org/en/latest/campaigns/2024/06/what-is-the-tiananmen-crackdown/