Leftist ideas cant survive the crucible thta is free speech. 4chan is/was the living proof of that. No one banned the leftists. No one spammed their threads or ran them into bump limits. No one made them leave the site. They chose to leave and make leftypol and migrate to other echo chambers. They could not defend their beliefs and could not convert anyone and could not handle scrutiny and banter. They chose to leave for somewhere they could enforce their worldview with impunity. To this day, you can go to 4chan and try and promote leftwing nutjob talking points, but you wont be able to defend yourself and will either have to face reality of how fucking degenerate and evil you are under mountains of proof or leave for reddit and other shithole echochambers with their bot armies and mandatory conformity. There are lots of different viewpoints on 4chan beyond le ebil natzi, too. The only ones that dont survive are leftists and its because you cant defend an ideology that is fundamentally evil once people are allowed to question your virtue signalling bullshit.