But it's a private org, they can limit speech how they see fit. Communities need to have rules; if not communities can become pretty toxic, and drive people away who might want to contribute, or even just seek help.
By making it clear they ban nazi's and the alt-right, people know what they're getting into when they join. I don't see the issue, and I don't buy into "horseshoe theory" or the idea that far left and far right are just two sides of the same coin, because they're not.
You're hearing lots about late stage capitalism because of the times we're in.
You're hearing lots about gender identity because until recently in modern capitalist society it was dangerous for people who didn't fit traditional gender norms to express that openly.