I agree that if is hypocritical however clearly the scale is substantially different. Subreddits are typically echochambers especially small niche non-defaults.

Twitter is a platform. Your analogy would be more akin to Reddit banning a subreddit-- which happens. I personally disagree with platforms like google, reddit & twtr editoralizing & policing things like ideology & expression. I certainly lean more libertarian here, but actions like this certainly are a slippery slope. It appears like favoritism in a benevolent view and censorship in a more hard line stance