I'm a libertarian socialist/communist (aka rabid leftist) and even I am often annoyed by how much of a "liberal" (whatever that means anymore) echo chamber reddit is.
People who have great points against the hive mind are often downvoted into oblivion. It's less of a place for discourse and more a place for voicing agreement. The worst experiences I've had are in the socialist/communist subreddits themselves. I've been banned from those places for saying things like "artists and homemakers are proletariat." I guess if you don't have a hammer in your hand you're just a neo-liberal reactionary??
And sure, T_D is a violent cesspool that should have been gone long ago, but in general I'm sick of social media platforms deciding for us what views are acceptable and what aren't. Their algorithms constantly guide people into weird places that drive engagement but at the expense of critical thought and real public discourse.
I'd much prefer free speech and neutral platforms over corporations deciding what we are to believe. But I suppose reddit's problems are now cultural and that's a more difficult problem to fix than adjusting an algorithm.