CTH was not very moderative of leftist hot takes. One of the things that probably contributed to their ban was that they regularly brigaded other subreddits (this was a common complaint throughout Reddit when I used it), and they regularly left calls for violence up such as "Guillotine Biden Now". They were also accused of ban evasion and other minor things.

EDIT: As another vector of this, there were similar accusations leveled at CTH as hexbear and Lemmy grad, where users claimed being banned for not buying more extreme views.